function PopWindow (url) { 
  var width = 600;
  var height = 360;
  var left = parseInt((screen.availWidth/2) - (width/2));
  var top = parseInt((screen.availHeight/2) - (height/2));
  var prams = 'menubar=0,location=0,left=' + left + ',top=' + top + ',resizable=1,scrollbars=1,width=' + width + ',height=' + height + ',border=0';
  newWin = window.open(url,'',prams);
  newWin.focus();
  return;
}