ปัญหา javascript เรื่อง ส่งค่าตัวแปรไปแล้วเอาไปแสดงไม่ตรงกับค่าที่ส่งไป

<?
echo "<table width='100%' cellpadding='0' cellspacing='0' border='0' bordercolor='#000000' align='center'><tr valign='top'>";
$intRows = 0; 

$sql1="select * from product ORDER BY RAND() LIMIT 0,15";
$result1=mysql_db_query($dbname,$sql1);
while($r1=mysql_fetch_array($result1))
{
	$idpro=$r1[ID_Pro];
	$remain=$r1[Remain];
	$qtysale=$r1[Qty_Sale];
	
	$idtype=$r1[ID_Type];
	$idcategory=$r1[ID_Category];
	$price=$r1[Price];
	$pic1=trim($r1[Pic1]);
	$size=$r1[Size];
	$intRows++;
	echo"<td>";		
?>
<table border="0" align="center" cellpadding="0" cellspacing="0" bordercolor="#000000">
<tr>
        	<td align="center"><span class="style36"><b>ราคา <? echo $price ?> บาท</b></span><br><br>
       	  <? echo "<img src='../Administer/PhotoProduct/$pic1' width='150' height='101'>"; ?><br>
				<span class="style33"><? echo "<a href='javascript:OWprodetail($idpro);'>[รายละเอียดสินค้า]</a>";?>&nbsp;&nbsp;
				<a href="Orderbasket_add3.php?id_prd=<? echo $idpro ?>">[สั่งทำสินค้า]</a></span>			</td>
		</tr>
	</table>
<br><hr>
	<?
			echo"</td>";
			if(($intRows)%3==0)
			{
			echo"</tr>";
			}
			else
			{
			echo "<td>";
			}
}
echo"</tr>
	</table>";
?>
<script language="JavaScript" type="text/JavaScript">
function OWprodetail(idproduct) 
{
window.open('ProductDetail.php?idpro='+idproduct,'','width=515,height=285');
}
</script>

<?

$idproduct=$_GET[idpro];
echo "$idproduct";
/*
$sql="select * from product where ID_Pro='$idpro2'";
$result = mysql_db_query($dbname,$sql);
$r=mysql_fetch_array($result)

$idpro1=$r[ID_Pro];
$idtype=$r[ID_Type];
$idcategory=$r[ID_Category];
$price=$r[Price];
$size=$r[Size];
$prodetail=$r[ProDetail];
$pic1=$r[Pic1];
*/
?>