อยากให้มันส่งค่า unit ที่ตรงกับ id_product ตัวนั้น ต้องทำไงค่ะ

<script language = "JavaScript">

		//**** List(Start) ***//
		function ListProvince(SelectValue)
		{
			frmMain.ddlProvince.length = 0
			
			
			//*** Insert null Default Value ***//
			var myOption = new Option('','')  
			frmMain.ddlProvince.options[frmMain.ddlProvince.length]= myOption
			
			<?
			$intRows = 0;
			$strSQL6 = "SELECT * FROM product ";
			$objQuery6 = mysql_query($strSQL6) or die ("Error Query [".$strSQL6."]");
			$intRows = 0;
			while($objResult6 = mysql_fetch_array($objQuery6))
			{
			$intRows++;
			?>			
				x = <?=$intRows;?>;
				mySubList = new Array();
				
				strGroup = <?=$objResult6["id_category"];?>;
				strValue = "<?=$objResult6["id_product"];?>";
				strItem = "<?=$objResult6["pname"];?>";
				strunit = "<?=$objResult6["unit"];?>";
				
				mySubList[x,0] = strItem;
				mySubList[x,1] = strGroup;
				mySubList[x,2] = strValue;
				
				if (mySubList[x,1] == SelectValue){
					var myOption = new Option(mySubList[x,0], mySubList[x,2] )  
					frmMain.ddlProvince.options[frmMain.ddlProvince.length]= myOption	
					frmMain.textfield.value = strunit	
					frmMain.textfield2.value = strunit								
				}
				
			<?
			}
			?>																	
		}
		//**** List(End) ***//
</script>