ช่วยดู code select list menu ชั้นที่ 4 ด้วยครับไม่รู้ว่าผิดตรงไหน list menu 1 2 3 ขึ้นปกติ แต่ตัวที่ 4 Center ไม่ขึ้นครับ

//**** List Province (Start) ***//
		function ListProvince(SelectValue)
		{
			document.frmMain.ddlProvince.length = 0
			document.frmMain.ddlAmphur.length = 0
			
			//*** Insert null Default Value ***//
			var myOption = new Option('','')  
			document.frmMain.ddlProvince.options[document.frmMain.ddlProvince.length]= myOption
			
			<?
			$intRows = 0;
			$strSQL = "SELECT * FROM tb_province ORDER BY province_ID ASC ";
			$objQuery = mysql_query($strSQL) or die ("Error Query [".$strSQL."]");
			$intRows = 0;
			while($objResult = mysql_fetch_array($objQuery))
			{
			$intRows++;
			?>			
				x = <?php echo $intRows;?>;
				mySubList = new Array();
				
				strGroup = <?php echo $objResult["geo_ID"];?>;
				strValue = "<?php echo $objResult["province_ID"];?>";
				strItem = "<?php echo $objResult["province_Name"];?>";
				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])  
					document.frmMain.ddlProvince.options[document.frmMain.ddlProvince.length]= myOption					
				}
			<?
			}
			?>																	
		}
		//**** List Province (End) ***//

		
		//**** List Amphur (Start) ***//
		function ListAmphur(SelectValue)
		{
			document.frmMain.ddlAmphur.length = 0
			document.frmMain.ddlCenter.length = 0

			//*** Insert null Default Value ***//
			var myOption = new Option('','')  
			document.frmMain.ddlAmphur.options[document.frmMain.ddlAmphur.length]= myOption
			
			<?
			$intRows = 0;
			$strSQL = "SELECT * FROM tb_amper ORDER BY amper_ID ASC ";
			$objQuery = mysql_query($strSQL) or die ("Error Query [".$strSQL."]");
			$intRows = 0;
			while($objResult = mysql_fetch_array($objQuery))
			{
			$intRows++;
			?>
				x = <?php echo $intRows;?>;
				mySubList = new Array();
				
				strGroup = <?php echo $objResult["province_ID"];?>;
				strValue = "<?php echo $objResult["amper_ID"];?>";
				strItem = "<?php echo $objResult["amper_Name"];?>";
				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])  
					document.frmMain.ddlAmphur.options[document.frmMain.ddlAmphur.length]= myOption					
				}
			<?
			}
			?>																	
		}
		//**** List Amphur (End) ***//
		
		//**** List Center (Start) ***//
		function ListCenter(SelectValue)
		{
			document.frmMain.ddlCenter.length = 0

			//*** Insert null Default Value ***//
			var myOption = new Option('','')  
			document.frmMain.ddlCenter.options[document.frmMain.ddlCenter.length]= myOption
			
			<?
			$intRows = 0;
			$strSQL = "SELECT * FROM tb_center ORDER BY center_ID ASC ";
			$objQuery = mysql_query($strSQL) or die ("Error Query [".$strSQL."]");
			$intRows = 0;
			while($objResult = mysql_fetch_array($objQuery))
			{
			$intRows++;
			?>
				x = <?php echo $intRows;?>;
				mySubList = new Array();
				
				strGroup = <?php echo $objResult["amper_ID"];?>;
				strValue = "<?php echo $objResult["center_ID"];?>";
				strItem = "<?php echo $objResult["center_Name"];?>";
				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])  
					document.frmMain.ddlCenter.options[document.frmMain.ddlCenter.length]= myOption					
				}
			<?
			}
			?>																	
		}
		//**** List Center (End) ***//