function popup(file,w,h)
{
	browserWidth = screen.width;
  	browserHeight = screen.height;
	
	offsetLeft = Math.floor((browserWidth - w) / 2);
	offsetTop = Math.floor((browserHeight - h) / 2);
	
	newwin = window.open(file,'luxplan','width='+ w +',height='+ h,'screenX=' + offsetLeft + ',screenY=' + offsetTop + ',locationbar=no,menubar=no,resizable=no,status=no');
	newwin.moveTo(offsetLeft, offsetTop);
}