window.onresize = setSize;
  function setSize()
  {
    cnt = document.getElementById('navblock');

      var y;
      if (self.innerHeight) // all except Explorer
      {
      	y = self.innerHeight;
      }
      else if (document.documentElement && document.documentElement.clientHeight)
      	// Explorer 6 Strict Mode
      {
      	y = document.documentElement.clientHeight;
      }
      else if (document.body) // other Explorers
      {
      	y = document.body.clientHeight;
      }
	cnt.style.height = y-205+"px"; //Abzug notwendig zur besseren Einpassung
    }