function openEBook(page)
{
  var Breite, Hoehe, posBreite, posHoehe, OrderWin;
  Breite    = screen.width  - (screen.width*0.20);
  Hoehe     = screen.height - (screen.height*0.15);
  if(Breite > 1280) { Breite = 1180; }
  if(Hoehe  >  1024) { Hoehe =  924; }

  posBreite = (screen.width/2) - (Breite/2);
  posHoehe  = (screen.height/2) - (Hoehe/2) - 20;

  window.open("http://www.rittal.de/downloads/eBook/HB33/de/index.html#/"+page+"/","eBook","width="+Breite+", height="+Hoehe+", left="+posBreite+", top="+posHoehe+", location=no, menubar=no, resizable=yes, scrollbars=no, status=no, toolbar=no, titlebar=no");
}