// POP-UP WINDOW SCRIPT
function centerPop(popURL,popWidth,popHeight) {
   if (document.all)
      var xMax = screen.width, yMax = screen.height;
   else
      if (document.layers)
        var xMax = window.outerWidth, yMax = window.outerHeight;
          else
            var xMax = 640, yMax=480;
   var xOffset = (xMax - popWidth)/2, yOffset = (yMax - popHeight)/2 - 50;
   window.open(popURL,'','width='+popWidth+',height='+popHeight+',screenX='+xOffset+',screenY='+yOffset+',top='+yOffset+',left='+xOffset+',scrollbars=yes,resizable=no,menubar=no,toolbar=no,location=no,directories=no,status=no');
}