function msie_fix() {
  var window_height=document.body.offsetHeight/4*3-50+"px";
  document.getElementById('scroll').style.height=window_height;
  document.getElementById('scroll').style.width = 800;
}

var windowHeight=screen.availHeight/4*3-100+"px"
document.getElementById("scroll").style.height = windowHeight;
document.getElementById("scroll").style.width = 800;
window.onresize=msie_fix;