function PopupURL(purl,title,w,h) {
     var winl = (screen.width - w) / 2;
     var wint = (screen.height - h) / 2;
     winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+'resizable=0';
   reqp = window.open(purl,title,winprops);
   reqp.focus();
   }