function getbg()
{
  var xsize = 0;
  var bgimagename = "bg1024.jpg";
  if(window.outerWidth > xsize)
    xsize = window.outerWidth;
  if(screen.width > xsize)
    xsize = screen.width;
  
  if(xsize > 1024)  
    bgimagename = "bg1280.jpg";
  if(xsize > 1280)  
    bgimagename = "bg1900.jpg";

  document.getElementsByTagName("body")[0].style.backgroundImage = "url(fileadmin/template/images/"+bgimagename+")";
  
  //var mytest = document.open("fileadmin/phpscripts/saveres.php?res=" + xsize);
  //alert(mytest);
  //return false;
}