function over(div){
div.style.backgroundImage = 'url(images/site/cellule_etudiant_top.png)';
div.style.color='#FFFFFF';
}
function out(div){
div.style.backgroundImage='url(images/site/cellule_etudiant.png)';
div.style.color='#1f87de';
}
function click(lien){
window.location.href=lien;
}

function divOver(submenu){
document.getElementById(submenu).style.display='block';
}
function divOut(submenu){
document.getElementById(submenu).style.display='none';
}
function subdivOver(submenu){
document.getElementById(submenu).style.display='block';
}
function subdivOut(submenu){
document.getElementById(submenu).style.display='none';
}