function openWindow(wurl,wwidth,wheight) {
   w = wwidth;
   h = wheight;
   var winl = (screen.width - w) / 2;
   var wint = (screen.height - h) / 2;
   winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl;
   d = new Date();
   popupWin = window.open(wurl, d.getHours() + d.getMinutes() + d.getSeconds() , winprops + ",status=no,toolbar=no,menubar=no,location=no,scrollbars=yes");
}