// pas de défilement :
var pas=1;
// hauteur de la partie visible
var h_fen="250px";
var h_fen_start="240px";
var stoc=0;

function scrollmrq(){
if ( parseInt(mrq.style.top) > -h_mrq+30 )
mrq.style.top = parseInt(mrq.style.top)-pas+"px";
else
mrq.style.top = h_fen_start;//fen.offsetHeight+"px";
}

window.onload=function() {
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_start;}
setInterval("scrollmrq()",50);
};