จะถามเกี่ยวกับ หาตำแหน่ง left และ top ของกล่องแต่ละอันนี้ยังไงค่ะ [มีรูป] ซึ่งกล่องทั้ง 3 อันนี้สามารถเคลื่อนที่ได้ค่ะ ขอความกรุณาด้วยนะค่ะ

/*
 * jQuery UI Multidraggable 1.0
 * 
 * Copyright (c) 2009 Tim Radnidge (xiaohouzi79 at gmail)
 *
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 *
* This code is based largely on and extends the jQuery UI Draggable 1.7.2  Copyright (c) 2009 jQuery UI authors(http://jqueryui.com/about)
 *
 * Depends:
 *	ui.draggable.js
 *	ui.core.js
 */
(function($) {

$.widget("ui.multidraggable", $.extend({}, $.ui.draggable.prototype, {
	_init: function() {

		if (this.options.helper == 'original' && !(/^(?:r|a|f)/).test(this.element.css("position")))
			this.element[0].style.position = 'relative';

		(this.options.addClasses && this.element.addClass("ui-draggable"));
		(this.options.disabled && this.element.addClass("ui-draggable-disabled"));

		this._mouseInit();
		
		this.options.isMain = false;

	},
	
	destroy: function() {
		if(!this.element.data('multidraggable')) return;
		this.element
			.removeData("multidraggable")
			.unbind(".draggable")
			.removeClass("ui-draggable"
				+ " ui-draggable-dragging"
				+ " ui-draggable-disabled");
		this._mouseDestroy();
	},

	_mouseCapture: function(event) {
		if (event.ctrlKey) {
			// Class for marking a multidraggable as being part of the group
			this.element.toggleClass('ui-multidraggable');
		}
		
		var o = this.options;

		if (this.helper || o.disabled || $(event.target).is('.ui-resizable-handle'))
			return false;

		//Quit if we're not on a valid handle
		this.handle = this._getHandle(event);
		if (!this.handle)
			return false;

		return true;

	},
	
	mouseStart: function(event, draggedOptions) {
		var o = this.options;
		
		if (this.element.hasClass('ui-multidraggable')) {
			this.options.draggedOptions = draggedOptions;
		}

		//Create and append the visible helper
		this.helper = this._createHelper(event);

		//Cache the helper size
		this._cacheHelperProportions();

		//If ddmanager is used for droppables, set the global draggable
		if($.ui.ddmanager)
			$.ui.ddmanager.current = this;

		/*
		 * - Position generation -
		 * This block generates everything position related - it's the core of draggables.
		 */

		//Cache the margins of the original element
		this._cacheMargins();

		//Store the helper's css position
		this.cssPosition = this.helper.css("position");
		this.scrollParent = this.helper.scrollParent();

		//The element's absolute position on the page minus margins
		this.offset = this.element.offset();
		this.offset = {
			top: this.offset.top - this.margins.top,
			left: this.offset.left - this.margins.left
		};

		$.extend(this.offset, {
			click: { //Where the click happened, relative to the element
				left: event.pageX - this.offset.left,
				top: event.pageY - this.offset.top
			},
			parent: this._getParentOffset(),
			relative: this._getRelativeOffset() //This is a relative to absolute position minus the actual position calculation - only used for relative positioned helper
		});

		//Generate the original position
		this.originalPosition = this._generatePosition(event);
		this.originalPageX = event.pageX;
		this.originalPageY = event.pageY;

		//Adjust the mouse offset relative to the helper if 'cursorAt' is supplied
		if (this.element.hasClass('ui-multidraggable') && o.isMain) {
			this._adjustOffsetFromHelper(o.cursorAt);
		} else if (o.cursorAt) {
			this._adjustOffsetFromHelper(o.cursorAt);
		}

		//Set a containment if given in the options
		if(o.containment)
			this._setContainment();

		//Call plugins and callbacks
		this._trigger("start", event);

		//Recache the helper size
		this._cacheHelperProportions();

		//Prepare the droppable offsets
		if ($.ui.ddmanager && !o.dropBehaviour)
			$.ui.ddmanager.prepareOffsets(this, event);

		this.helper.addClass("ui-draggable-dragging");
		this.mouseDrag(event, true); //Execute the drag once - this causes the helper not to be visible before getting its correct position
		return true;
	},

	_mouseStart: function(event) {
		var o = this.options;
	
		if (this.element.hasClass('ui-multidraggable')) {
			this.options.isMain = true;
			$(".ui-multidraggable").multidraggable("mouseStart", event, o);
			return true;
		} else {
			this.mouseStart(event, o);
		}
	},
	
	mouseDrag: function(event, noPropagation) {

		//Compute the helpers position
		this.position = this._generatePosition(event);
		this.positionAbs = this._convertPositionTo("absolute");

		//Call plugins and callbacks and use the resulting position if something is returned
		if (!noPropagation) {
			var ui = this._uiHash();
			this._trigger('drag', event, ui);
			this.position = ui.position;
		}
		
		if (this.element.hasClass('ui-multidraggable')) {
			if((!this.options.axis && !this.options.draggedOptions.axis) || (this.options.axis != "y" && this.options.draggedOptions.axis != "y")) this.helper[0].style.left = this.position.left+'px';
			if((!this.options.axis && !this.options.draggedOptions.axis) || (this.options.axis != "x" && this.options.draggedOptions.axis != "x")) this.helper[0].style.top = this.position.top+'px';
		} else {
			if(!this.options.axis || this.options.axis != "y") this.helper[0].style.left = this.position.left+'px';
			if(!this.options.axis || this.options.axis != "x") this.helper[0].style.top = this.position.top+'px';		
		}
		if($.ui.ddmanager) $.ui.ddmanager.drag(this, event);

		return false;
	},

	_mouseDrag: function(event, noPropagation) {
		if (this.element.hasClass('ui-multidraggable')) {
			$(".ui-multidraggable").multidraggable("mouseDrag", event, noPropagation);
			return false;
		} else {
			this.mouseDrag(event, noPropagation, this.options);
			return false;
		}
	},
	
	mouseStop: function(event) {

		//If we are using droppables, inform the manager about the drop
		var dropped = false;
		if ($.ui.ddmanager && !this.options.dropBehaviour)
			dropped = $.ui.ddmanager.drop(this, event);

		//if a drop comes from outside (a sortable)
		if(this.dropped) {
			dropped = this.dropped;
			this.dropped = false;
		}

		if((this.options.revert == "invalid" && !dropped) || (this.options.revert == "valid" && dropped) || this.options.revert === true || ($.isFunction(this.options.revert) && this.options.revert.call(this.element, dropped))) {
			var self = this;
			$(this.helper).animate(this.originalPosition, parseInt(this.options.revertDuration, 10), function() {
				self._trigger("stop", event);
				self._clear();
			});
		} else {
			this._trigger("stop", event);
			this._clear();
		}

		return false;
	},	

	_mouseStop: function(event) {
		if (this.element.hasClass('ui-multidraggable')) {
			$(".ui-multidraggable").multidraggable("mouseStop", event);
			return false;
		} else {
			this.mouseStop(event);
			return false;
		}
	},

	_clear: function() {
		this.helper.removeClass("ui-draggable-dragging");
		if(this.helper[0] != this.element[0] && !this.cancelHelperRemoval) this.helper.remove();
		//if($.ui.ddmanager) $.ui.ddmanager.current = null;
		this.options.isMain = false;
		this.helper = null;
		this.cancelHelperRemoval = false;
	},

	plugins: {},

}));

$.extend($.ui.multidraggable, {
	version: "1.7.2",
	eventPrefix: "drag",
	defaults: {
		addClasses: true,
		appendTo: "parent",
		axis: false,
		cancel: ":input,option",
		connectToSortable: false,
		containment: false,
		cursor: "auto",
		cursorAt: false,
		delay: 0,
		distance: 1,
		grid: false,
		handle: false,
		helper: "original",
		iframeFix: false,
		opacity: false,
		refreshPositions: false,
		revert: false,
		revertDuration: 500,
		scope: "default",
		scroll: true,
		scrollSensitivity: 20,
		scrollSpeed: 20,
		snap: false,
		snapMode: "both",
		snapTolerance: 20,
		stack: false,
		zIndex: false
	}
});

$.ui.plugin.add("multidraggable", "connectToSortable", {
	start: function(event, ui) {

		var inst = $(this).data("multidraggable"), o = inst.options,
			uiSortable = $.extend({}, ui, { item: inst.element });
		inst.sortables = [];
		$(o.connectToSortable).each(function() {
			var sortable = $.data(this, 'sortable');
			if (sortable && !sortable.options.disabled) {
				inst.sortables.push({
					instance: sortable,
					shouldRevert: sortable.options.revert
				});
				sortable._refreshItems();	//Do a one-time refresh at start to refresh the containerCache
				sortable._trigger("activate", event, uiSortable);
			}
		});

	},
	stop: function(event, ui) {

		//If we are still over the sortable, we fake the stop event of the sortable, but also remove helper
		var inst = $(this).data("multidraggable"),
			uiSortable = $.extend({}, ui, { item: inst.element });

		$.each(inst.sortables, function() {
			if(this.instance.isOver) {

				this.instance.isOver = 0;

				inst.cancelHelperRemoval = true; //Don't remove the helper in the draggable instance
				this.instance.cancelHelperRemoval = false; //Remove it in the sortable instance (so sortable plugins like revert still work)

				//The sortable revert is supported, and we have to set a temporary dropped variable on the draggable to support revert: 'valid/invalid'
				if(this.shouldRevert) this.instance.options.revert = true;

				//Trigger the stop of the sortable
				this.instance._mouseStop(event);

				this.instance.options.helper = this.instance.options._helper;

				//If the helper has been the original item, restore properties in the sortable
				if(inst.options.helper == 'original')
					this.instance.currentItem.css({ top: 'auto', left: 'auto' });

			} else {
				this.instance.cancelHelperRemoval = false; //Remove the helper in the sortable instance
				this.instance._trigger("deactivate", event, uiSortable);
			}

		});

	},
	drag: function(event, ui) {

		var inst = $(this).data("multidraggable"), self = this;

		var checkPos = function(o) {
			var dyClick = this.offset.click.top, dxClick = this.offset.click.left;
			var helperTop = this.positionAbs.top, helperLeft = this.positionAbs.left;
			var itemHeight = o.height, itemWidth = o.width;
			var itemTop = o.top, itemLeft = o.left;

			return $.ui.isOver(helperTop + dyClick, helperLeft + dxClick, itemTop, itemLeft, itemHeight, itemWidth);
		};

		$.each(inst.sortables, function(i) {
			
			//Copy over some variables to allow calling the sortable's native _intersectsWith
			this.instance.positionAbs = inst.positionAbs;
			this.instance.helperProportions = inst.helperProportions;
			this.instance.offset.click = inst.offset.click;
			
			if(this.instance._intersectsWith(this.instance.containerCache)) {

				//If it intersects, we use a little isOver variable and set it once, so our move-in stuff gets fired only once
				if(!this.instance.isOver) {

					this.instance.isOver = 1;
					//Now we fake the start of dragging for the sortable instance,
					//by cloning the list group item, appending it to the sortable and using it as inst.currentItem
					//We can then fire the start event of the sortable with our passed browser event, and our own helper (so it doesn't create a new one)
					this.instance.currentItem = $(self).clone().appendTo(this.instance.element).data("sortable-item", true);
					this.instance.options._helper = this.instance.options.helper; //Store helper option to later restore it
					this.instance.options.helper = function() { return ui.helper[0]; };

					event.target = this.instance.currentItem[0];
					this.instance._mouseCapture(event, true);
					this.instance._mouseStart(event, true, true);

					//Because the browser event is way off the new appended portlet, we modify a couple of variables to reflect the changes
					this.instance.offset.click.top = inst.offset.click.top;
					this.instance.offset.click.left = inst.offset.click.left;
					this.instance.offset.parent.left -= inst.offset.parent.left - this.instance.offset.parent.left;
					this.instance.offset.parent.top -= inst.offset.parent.top - this.instance.offset.parent.top;

					inst._trigger("toSortable", event);
					inst.dropped = this.instance.element; //draggable revert needs that
					//hack so receive/update callbacks work (mostly)
					inst.currentItem = inst.element;
					this.instance.fromOutside = inst;

				}

				//Provided we did all the previous steps, we can fire the drag event of the sortable on every draggable drag, when it intersects with the sortable
				if(this.instance.currentItem) this.instance._mouseDrag(event);

			} else {

				//If it doesn't intersect with the sortable, and it intersected before,
				//we fake the drag stop of the sortable, but make sure it doesn't remove the helper by using cancelHelperRemoval
				if(this.instance.isOver) {

					this.instance.isOver = 0;
					this.instance.cancelHelperRemoval = true;
					
					//Prevent reverting on this forced stop
					this.instance.options.revert = false;
					
					// The out event needs to be triggered independently
					this.instance._trigger('out', event, this.instance._uiHash(this.instance));
					
					this.instance._mouseStop(event, true);
					this.instance.options.helper = this.instance.options._helper;

					//Now we remove our currentItem, the list group clone again, and the placeholder, and animate the helper back to it's original size
					this.instance.currentItem.remove();
					if(this.instance.placeholder) this.instance.placeholder.remove();

					inst._trigger("fromSortable", event);
					inst.dropped = false; //draggable revert needs that
				}

			};

		});

	}
});

$.ui.plugin.add("multidraggable", "cursor", {
	start: function(event, ui) {
		if ($(this).hasClass('ui-multidraggable')) {
			if ($(this).data('multidraggable').options.isMain == false) {
				return;
			}
		}
		var t = $('body'), o = $(this).data('multidraggable').options;
		if (t.css("cursor")) o._cursor = t.css("cursor");
		t.css("cursor", o.cursor);
	},
	stop: function(event, ui) {
		if ($(this).hasClass('ui-multidraggable')) {
			if ($(this).data('multidraggable').options.isMain == false) {
				return;
			}
		}	
		var o = $(this).data('multidraggable').options;
		if (o._cursor) $('body').css("cursor", o._cursor);
	}
});

$.ui.plugin.add("multidraggable", "iframeFix", {
	start: function(event, ui) {
		var o = $(this).data('multidraggable').options;
		$(o.iframeFix === true ? "iframe" : o.iframeFix).each(function() {
			$('<div class="ui-draggable-iframeFix" style="background: #fff;"></div>')
			.css({
				width: this.offsetWidth+"px", height: this.offsetHeight+"px",
				position: "absolute", opacity: "0.001", zIndex: 1000
			})
			.css($(this).offset())
			.appendTo("body");
		});
	},
	stop: function(event, ui) {
		$("div.ui-draggable-iframeFix").each(function() { this.parentNode.removeChild(this); }); //Remove frame helpers
	}
});

$.ui.plugin.add("multidraggable", "opacity", {
	start: function(event, ui) {
		var t = $(ui.helper), o = $(this).data('multidraggable').options;
		if(t.css("opacity")) o._opacity = t.css("opacity");
		t.css('opacity', o.opacity);
	},
	stop: function(event, ui) {
		var o = $(this).data('multidraggable').options;
		if(o._opacity) $(ui.helper).css('opacity', o._opacity);
	}
});

$.ui.plugin.add("multidraggable", "scroll", {
	start: function(event, ui) {
		var i = $(this).data("multidraggable");
		if(i.scrollParent[0] != document && i.scrollParent[0].tagName != 'HTML') i.overflowOffset = i.scrollParent.offset();
	},
	drag: function(event, ui) {

		var i = $(this).data("multidraggable"), o = i.options, scrolled = false;

		if(i.scrollParent[0] != document && i.scrollParent[0].tagName != 'HTML') {

			if(!o.axis || o.axis != 'x') {
				if((i.overflowOffset.top + i.scrollParent[0].offsetHeight) - event.pageY < o.scrollSensitivity)
					i.scrollParent[0].scrollTop = scrolled = i.scrollParent[0].scrollTop + o.scrollSpeed;
				else if(event.pageY - i.overflowOffset.top < o.scrollSensitivity)
					i.scrollParent[0].scrollTop = scrolled = i.scrollParent[0].scrollTop - o.scrollSpeed;
			}

			if(!o.axis || o.axis != 'y') {
				if((i.overflowOffset.left + i.scrollParent[0].offsetWidth) - event.pageX < o.scrollSensitivity)
					i.scrollParent[0].scrollLeft = scrolled = i.scrollParent[0].scrollLeft + o.scrollSpeed;
				else if(event.pageX - i.overflowOffset.left < o.scrollSensitivity)
					i.scrollParent[0].scrollLeft = scrolled = i.scrollParent[0].scrollLeft - o.scrollSpeed;
			}

		} else {

			if(!o.axis || o.axis != 'x') {
				if(event.pageY - $(document).scrollTop() < o.scrollSensitivity)
					scrolled = $(document).scrollTop($(document).scrollTop() - o.scrollSpeed);
				else if($(window).height() - (event.pageY - $(document).scrollTop()) < o.scrollSensitivity)
					scrolled = $(document).scrollTop($(document).scrollTop() + o.scrollSpeed);
			}

			if(!o.axis || o.axis != 'y') {
				if(event.pageX - $(document).scrollLeft() < o.scrollSensitivity)
					scrolled = $(document).scrollLeft($(document).scrollLeft() - o.scrollSpeed);
				else if($(window).width() - (event.pageX - $(document).scrollLeft()) < o.scrollSensitivity)
					scrolled = $(document).scrollLeft($(document).scrollLeft() + o.scrollSpeed);
			}

		}

		if(scrolled !== false && $.ui.ddmanager && !o.dropBehaviour)
			$.ui.ddmanager.prepareOffsets(i, event);

	}
});

$.ui.plugin.add("multidraggable", "snap", {
	start: function(event, ui) {

		var i = $(this).data("multidraggable"), o = i.options;
		i.snapElements = [];

		$(o.snap.constructor != String ? ( o.snap.items || ':data(draggable)' ) : o.snap).each(function() {
			var $t = $(this); var $o = $t.offset();
			if(this != i.element[0]) i.snapElements.push({
				item: this,
				width: $t.outerWidth(), height: $t.outerHeight(),
				top: $o.top, left: $o.left
			});
		});

	},
	drag: function(event, ui) {

		var inst = $(this).data("multidraggable"), o = inst.options;
		var d = o.snapTolerance;

		var x1 = ui.offset.left, x2 = x1 + inst.helperProportions.width,
			y1 = ui.offset.top, y2 = y1 + inst.helperProportions.height;

		for (var i = inst.snapElements.length - 1; i >= 0; i--){

			var l = inst.snapElements[i].left, r = l + inst.snapElements[i].width,
				t = inst.snapElements[i].top, b = t + inst.snapElements[i].height;

			//Yes, I know, this is insane ;)
			if(!((l-d < x1 && x1 < r+d && t-d < y1 && y1 < b+d) || (l-d < x1 && x1 < r+d && t-d < y2 && y2 < b+d) || (l-d < x2 && x2 < r+d && t-d < y1 && y1 < b+d) || (l-d < x2 && x2 < r+d && t-d < y2 && y2 < b+d))) {
				if(inst.snapElements[i].snapping) (inst.options.snap.release && inst.options.snap.release.call(inst.element, event, $.extend(inst._uiHash(), { snapItem: inst.snapElements[i].item })));
				inst.snapElements[i].snapping = false;
				continue;
			}

			if(o.snapMode != 'inner') {
				var ts = Math.abs(t - y2) <= d;
				var bs = Math.abs(b - y1) <= d;
				var ls = Math.abs(l - x2) <= d;
				var rs = Math.abs(r - x1) <= d;
				if(ts) ui.position.top = inst._convertPositionTo("relative", { top: t - inst.helperProportions.height, left: 0 }).top - inst.margins.top;
				if(bs) ui.position.top = inst._convertPositionTo("relative", { top: b, left: 0 }).top - inst.margins.top;
				if(ls) ui.position.left = inst._convertPositionTo("relative", { top: 0, left: l - inst.helperProportions.width }).left - inst.margins.left;
				if(rs) ui.position.left = inst._convertPositionTo("relative", { top: 0, left: r }).left - inst.margins.left;
			}

			var first = (ts || bs || ls || rs);

			if(o.snapMode != 'outer') {
				var ts = Math.abs(t - y1) <= d;
				var bs = Math.abs(b - y2) <= d;
				var ls = Math.abs(l - x1) <= d;
				var rs = Math.abs(r - x2) <= d;
				if(ts) ui.position.top = inst._convertPositionTo("relative", { top: t, left: 0 }).top - inst.margins.top;
				if(bs) ui.position.top = inst._convertPositionTo("relative", { top: b - inst.helperProportions.height, left: 0 }).top - inst.margins.top;
				if(ls) ui.position.left = inst._convertPositionTo("relative", { top: 0, left: l }).left - inst.margins.left;
				if(rs) ui.position.left = inst._convertPositionTo("relative", { top: 0, left: r - inst.helperProportions.width }).left - inst.margins.left;
			}

			if(!inst.snapElements[i].snapping && (ts || bs || ls || rs || first))
				(inst.options.snap.snap && inst.options.snap.snap.call(inst.element, event, $.extend(inst._uiHash(), { snapItem: inst.snapElements[i].item })));
			inst.snapElements[i].snapping = (ts || bs || ls || rs || first);

		};

	}
});

$.ui.plugin.add("multidraggable", "stack", {
	start: function(event, ui) {

		var o = $(this).data("multidraggable").options;

		var group = $.makeArray($(o.stack.group)).sort(function(a,b) {
			return (parseInt($(a).css("zIndex"),10) || o.stack.min) - (parseInt($(b).css("zIndex"),10) || o.stack.min);
		});

		$(group).each(function(i) {
			this.style.zIndex = o.stack.min + i;
		});
		
		if ($(this).hasClass('ui-multidraggable')) {
			if ($(this).data('multidraggable').options.isMain == true) {
				this[0].style.zIndex = o.stack.min + group.length;
			}
		} else {		
			this[0].style.zIndex = o.stack.min + group.length;
		}

	}
});

$.ui.plugin.add("multidraggable", "zIndex", {
	start: function(event, ui) {
		var t = $(ui.helper), o = $(this).data("multidraggable").options;
		if(t.css("zIndex")) o._zIndex = t.css("zIndex");
		t.css('zIndex', o.zIndex);
	},
	stop: function(event, ui) {
		var o = $(this).data("multidraggable").options;
		if(o._zIndex) $(ui.helper).css('zIndex', o._zIndex);
	}
});

})(jQuery);

<!doctype html>
<html lang="en">
<head>
	<title>UI multidraggable demo</title>
	<link type="text/css" href="./css/styles.css" rel="stylesheet" />
	<script type="text/javascript" src="http://www.google.com/jsapi"></script>
	<script type="text/javascript">
		google.load("jquery", "1.3.2");
		google.load("jqueryui", "1.7.2");
	</script>	
	<script type="text/javascript" src="./js/ui.multidraggable.js"></script>
	<script type="text/javascript">
	$(function() {
		$(".multidraggable").multidraggable({"containment":"parent"});
	});
	</script>	
	

</head>
<body>
	
	<div id="demo_area">
		<div class="multidraggable" id="1">
			<p>1</p>
		</div>
		<div class="multidraggable">
			<p>2</p>
		</div>
		<div class="multidraggable">
			<p>3</p>
		</div>
	</div>
	
</body>
</html>