function openWind(window1, widht, heigt){	
    var w = 480;
    var h = 340;
    
    if (document.all) {
   /* the following is only available after onLoad */
      w = document.body.clientWidth;
      h = document.body.clientHeight;
    }
    else if (document.layers) {
      w = window.innerWidth;
      h = window.innerHeight;
    }
    var popW = widht, popH = heigt;
    
    var leftPos = (w-popW)/2, topPos = (h-popH)/2;
        
    if(window1 == "TellAFriend.aspx")
    {   
       winpops=window.open(window1,"",'width=' + widht + ',height=' + heigt + ',scrollbars,status=1,top=topPos,left=leftPos')
    }
    else
    {        
       winpops=window.open(window1,"",'width=' +widht + ',height=' + heigt + ',top=topPos,left=leftPos,scrollbars,resizable=yes, status=yes,, toolbar=yes,location=yes,menubar=yes')       
    }
}