function productimagedetail(product_id) { 
   var w = 120; 
   var h = 120; 
   var center = ',left = 387,top = 309'; 
   window.open('product_detailed_images.php?productid='+product_id,"detailedproduct","width="+w+",height="+h+",resizable,scrollbars=yes,status=no'"); 
}