var pas=1
var h_fen="100px"
function scrollmrq(){
if (parseInt(mrq.style.top) > -h_mrq ) 
mrq.style.top = parseInt(mrq.style.top)-pas+"px"
else mrq.style.top=parseInt(h_fen)+"px"
}
function init_mrq(){
mrq=document.getElementById("menu_defile");
fen=document.getElementById("menu_deroulant");
fen.onmouseover=function(){stoc=pas;pas=0};

fen.onmouseout=function(){pas=stoc};fen.style.height=h_fen;
h_mrq=mrq.offsetHeight;
with(mrq.style){position="absolute";top=h_fen;}
setInterval("scrollmrq()",50);
}
window.onload =init_mrq;