ช่วยอธิบายทีครับ เรื่อง database จังหวัด จาก THAICREATE

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

			//*** Insert null Default Value ***//
			var myOption = new Option('','')  
			frmMain.ddlAmphur.options[frmMain.ddlAmphur.length]= myOption
			
			<?
			$intRows = 0;
			$strSQL = "SELECT * FROM ms_sale_area";
			$objQuery = mysql_query($strSQL) or die ("Error Query [".$strSQL."]");
			$intRows = 0;
			while($objResult = mysql_fetch_array($objQuery))
			{
			$intRows++;
			?>
				x = <?=$intRows;?>;
				mySubList = new Array();
				
				strGroup = <?=$objResult["province_code"];?>;
				strValue = "<?=$objResult["area_code"];?>";
				strItem = "<?=$objResult["area_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])  
					frmMain.ddlAmphur.options[frmMain.ddlAmphur.length]= myOption					
				}
			<?
			}
			?>																	
		}
		//**** List Amphur (End) ***//

</script>


</head>
<form name="frmMain" action="" method="post">


	Province
	<select id="ddlProvince" name="ddlProvince" style="width:120px" onChange = "ListAmphur(this.value)">
    <?
	$strSQL = "SELECT * FROM ms_province";
	$objQuery = mysql_query($strSQL) or die ("Error Query [".$strSQL."]");
	while($objResult = mysql_fetch_array($objQuery))
	{
	?>
	<option value="<?=$objResult["province_code"];?>"><?=$objResult["province_name"];?></option>
	<?
	}
	?>
    
    </select>

	Amphur
	<select id="ddlAmphur" name="ddlAmphur" style="width:200px">
    

    </select>
</form>
</body>
</html>
<?
	mysql_close($objConnect);

strGroup = "<?=$objResult["province_code"];?>";