ต้องการเปลี่ยน หัวหมุดของ GOOGLE MAP ครับ .... รบกวนทุกท่านด้วย

<script type="text/javascript">
		
		
		//<![CDATA[
		
		var gmarkers = [];
		var htmls = [];
		var i = 0;
		var side_bar_html = "";
		var map = "";
		
		function load() 
		{
			
			if (GBrowserIsCompatible()) {
				map = new GMap2(document.getElementById("map"));
				map.addControl(new GLargeMapControl());
				map.addControl(new GMapTypeControl());
		
				map.setCenter(new GLatLng(13.77754, 100.55765), 11);
				
				readMap();
			}
			else {
				alert("Sorry, the Google Maps API is not compatible with this browser");
			}
		}
		
		function process_it(doc) 
		{
			lines = doc.split("\n");
			for(var i = 0; i < lines.length; i++) 
			{
				if( lines[i].length > 1) {
					parts = lines[i].split("|");
					var lat = parseFloat(parts[0]);
					var lng = parseFloat(parts[1]);
					var html = parts[2];
					var label = parts[3];
					var CusID = parts[4];
					var point = new GLatLng(lat,lng);
					// create the marker
					var marker = createMarker(point,label,html,CusID);
					map.addOverlay(marker);
				}
			}
			document.getElementById("side_bar").innerHTML = side_bar_html;
		}
		
		function readMap()
		{
			var url="mapdata.php";
			var request = GXmlHttp.create();
			request.open("GET", url, true);
			request.onreadystatechange = function() {
				if (request.readyState == 4) {
					var txtDoc = request.responseText;
					process_it(txtDoc);
				}
			}
			request.send(null);
		}
		
		function createMarker(point,name,html,CusID)
		{
	
			var marker = new GMarker(point);
			GEvent.addListener(marker, "click", function() {
			  marker.openInfoWindowHtml(html);
			});
			
			gmarkers[i] = marker;
			htmls[i] = html;
			
			if (point == "(0, 0)") {
					side_bar_html += '<a href="javascript:myclick(' + i + ')"><span style="color: #F66">' + name + " " + point + '</span><\/a> <a id="various3" href="update.php?CustID=' + CusID + '"><SPAN STYLE="font-weight:bold; text-decoration: none; color: #000;">UPDATE</SPAN></a> <br>';//Display Customer NO POINT
					
			}else{
					side_bar_html += '<a href="javascript:myclick(' + i + ')">' + name + '<\/a><br>';//Display Customer HAVE POINT
			}
			
			i++;
		
			return marker;
		}
		
		function myclick(i) 
		{
			gmarkers[i].openInfoWindowHtml(htmls[i]);
		}
		
		//]]>
		

    </script>