function winPop (urlToPopup, height, width, pnPopup, sBars){
if(!pnPopup){var pnPopup="pnPopup"}
if(!sBars){var sBars="yes"}
if(!height){height="450"}
if(!width){width="700"}
var x = (screen.availWidth - width) / 2;
var y = (screen.availHeight - height) / 2;
var popup = open(urlToPopup, pnPopup, 'toolbar=no,location=no,directories=no,status=no,menub ar=no,scrollbars='+sBars+',resizable=yes,copyhistory=yes,width='+width+',height='+height+',left='+x+', top='+y+',screenX='+x+',screenY='+y+'');
popup.resizeTo(width,height);
popup.focus();
}