// JavaScript Document
function FensterHoehe () {
  if (window.innerHeight) {
    return window.innerHeight;
  } else if (document.body && document.body.offsetHeight) {
    return document.body.offsetHeight;
  } else {
    return 0;
  }
}

Hoehe = FensterHoehe ()
if (Hoehe > 630) { 
	abstand = parseInt((Hoehe - 600)/2);
document.getElementById("paper").style.top = abstand + "px" ;
}