function setsize()
 {
  var h=-1; 
  if (self.innerHeight) 
 	h = self.innerHeight; 
  else if (document.documentElement && document.documentElement.clientHeight) 
	h = document.documentElement.clientHeight; 
  else if (document.body) 
	h = document.body.clientHeight;

  var obj = document.getElementById('main');

  var ch = obj.clientHeight;
  var nsize = (h - 440);
  if (nsize > ch) obj.style.height = nsize+'px';
 }