function PopWin(url,h,w) 
{ 
	
	var ww = 480, wh = 340, leftPos = null, topPos = null;

	IE=(document.all)?true:false;
	var wh = (IE)?document.body.clientHeight : window.innerHeight;
	var ww = (IE)?document.body.clientWidth : window.innerWidth;
	
	if (top.screen){
	  if (screen.width){
	    leftPos = Math.round((ww-w-10)/2);
	    //topPos = Math.round((wh-h-29)/2);
	    topPos = 100
	  } else {
	    leftPos = 50
	    topPos = 50
	  }
	}

 	popupWin = window.open(url, 'product_image', 'scrollbars,resizable,height=' + h + ',width=' + w + ',top=' + topPos + ',left=' + leftPos + '')
}