function handleScroll(){ 
document.getElementById("menu").style.top = (document.body.offsetHeight*0.87 + document.body.scrollTop) +"px"; 
} 
function pop_menu(){ 
var toogle = document.getElementById("popmenu2"); 
if(toogle.style.display == "" || toogle.style.display == "none"){ 
toogle.style.display = "block"; 
}else{ 
toogle.style.display = "none"; 
} 
}
function init_menu(){
document.body.onscroll="handleScroll()";
document.body.onload="handleScroll()";
document.getElementById("popmenu").onmouseover=pop_menu;
document.getElementById("popmenu").onmouseout=pop_menu;
}
window.onload=init_menu;