มีเรื่องอยากจะถามขอคำแนะนำด้วยครับ ส่วนนี้เป็น code วน loop เพื่อสร้าง Textbox รับข้อมูล นะครับ

//--------------------------------------->เป็นส่วนที่รับค่า เพื่อที่สร้าง loop
<input type="text" id="row_tb" name="row_tb" />
  <input type="button" name="Button" value="Insert Record" onclick="loop_insert()" />
//<----------------------------------------
       <script>
function loop_insert(){
var num=document.getElementById('row_tb').value
	for(i=1;i<=num;i++){
		insert_row()
	}
}

function insert_row(){
var myTable=document.getElementById('myTable')
var current_row=document.getElementById('myTable').rows.length
var x=myTable.insertRow(current_row)		// insert new row
var y=myTable.rows				// get attribute of row
var a=x.insertCell(0)			// assign position of cell 1 in new row
var b=x.insertCell(1)			// assign position of cell 2 in new row
var c=x.insertCell(2)			// assign position of cell 3 in new row
var d=x.insertCell(3)			// assign position of cell 4 in new row
var f=x.insertCell(4)			// assign position of cell 5 in new row
var e=x.insertCell(5)			// assign position of cell 6 in new row
var g=x.insertCell(6)			// assign position of cell 7 in new row
	a.innerHTML=current_row
	b.innerHTML="<input type='text' name='Description[]' size='40' id='txtDescription' />"
	c.innerHTML="<input type='text' name='Supplier_name.[]' size='40' id='txtSupplier_name' />"
	d.innerHTML="<input type='text' name='Size[]' size='3' id='txtSize' />"
	f.innerHTML="<input type='text' name='Quantity[]' size='6' id='txtQuantity' />"
	e.innerHTML="<input type='text' name='Prize[]' size='3' id='txtPrize'/>"
	g.innerHTML="<input type='text' name='Source[]' id='txtSource' />"
	
}
</script>

<script language="JavaScript">
	   var HttPRequest = false;

	   function doCallAjax() {
		  HttPRequest = false;
		  if (window.XMLHttpRequest) { // Mozilla, Safari,...
			 HttPRequest = new XMLHttpRequest();
			 if (HttPRequest.overrideMimeType) {
				HttPRequest.overrideMimeType('text/html');
			 }
		  } else if (window.ActiveXObject) { // IE
			 try {
				HttPRequest = new ActiveXObject("Msxml2.XMLHTTP");
			 } catch (e) {
				try {
				   HttPRequest = new ActiveXObject("Microsoft.XMLHTTP");
				} catch (e) {}
			 }
		  } 
		  
		  if (!HttPRequest) {
			 alert('Cannot create XMLHTTP instance');
			 return false;
		  }
		  
		  	var Order_type = '';
			var Equipment = document.getElementById('Equipment');
			var Chemical = document.getElementById('Chemical');
			var Ebzyme = document.getElementById('Ebzyme');
			var Other = document.getElementById('Other');
			
			
			if(Equipment.checked==true){
				Order_type = Equipment.value;
			}
			
			if(Chemical.checked==true){
				Order_type = Chemical.value;
			}
			
			if(Ebzyme.checked==true){
				Order_type = Ebzyme.value;
			}
			
			if(Other.checked==true){
				Order_type = Other.value;
			}
			
			 
		
			

		  var url = 'excel_ordersave.php';
		  var pmeters = "tRequest_name=" + encodeURI( document.getElementById("txtRequest_name").value) +
						"&tdatepicker=" + encodeURI( document.getElementById("datepicker").value ) +                     
						"&tProject=" + encodeURI( document.getElementById("txtProject").value ) +
						"&tRequested_objective=" + encodeURI( document.getElementById("txtRequested_objective").value ) +
						"&tDescription=" + encodeURI( document.getElementById("txtDescription").value ) +
						"&tSupplier_name=" + encodeURI( document.getElementById("txtSupplier_name").value ) +
						"&tSize=" + encodeURI( document.getElementById("txtSize").value ) +
						"&tQuantity=" + encodeURI( document.getElementById("txtQuantity").value ) +
						"&tPrize=" + encodeURI( document.getElementById("txtPrize").value ) +
						"&tSource=" + encodeURI( document.getElementById("txtSource").value ) +
						"&tOther=" + encodeURI( document.getElementById("txtOther").value ) +
						"&tOrder_type="+ Order_type;
						
						
			
						
						
			HttPRequest.open('POST',url,true);

			HttPRequest.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
			HttPRequest.setRequestHeader("Content-length", pmeters.length);
			HttPRequest.setRequestHeader("Connection", "close");
			HttPRequest.send(pmeters);
			
			
			HttPRequest.onreadystatechange = function()
			{

				 if(HttPRequest.readyState == 3)  // Loading Request
				  {
				   document.getElementById("mySpan").innerHTML = "Now is Loading...";
				  }

				 if(HttPRequest.readyState == 4) // Return Request
				  {
				   document.getElementById("mySpan").innerHTML = HttPRequest.responseText;			  
				  }
				
			}

	   }
	</script>