window.setTimeout("setbtn()",100);
function setbtn(){
  if (navigator.appName!="Netscape"){
    document.getElementById("btn").style.top=eval(5+eval(document.body.scrollTop)); 
    document.getElementById("menu").style.top=eval(0+eval(document.body.scrollTop)); 
  }else{
    document.getElementById("btn").style.top=eval(5+eval(window.pageYOffset));
    document.getElementById("menu").style.top=eval(0+eval(window.pageYOffset));
  }
  window.setTimeout("setbtn()",100);
}