var time;
function fini()
{
    clearTimeout(time);
}

function ferme()
{
document.getElementById('enf').style.visibility="hidden";
document.getElementById('enf').style.backgroundimage="";
document.getElementById('pedagogie').style.visibility="hidden";
document.getElementById('pedagogie').style.backgroundimage="";
document.getElementById('outils').style.visibility="hidden";
document.getElementById('outils').style.backgroundimage="";
document.getElementById('jeux').style.visibility="hidden";
document.getElementById('jeux').style.backgroundimage="";
}


function ouvre(a)
{
ferme();
if (time) { fini(); }
time = setTimeout("ferme()",800);



document.getElementById(a).style.visibility="visible";
document.getElementById(a).style.backgroundImage="url('images/b.jpg')";

if (a== "enf")
{
    document.getElementById(a).style.backgroundPosition="553px -1px";

}

else if (a== "pedagogie")
{
    document.getElementById(a).style.backgroundPosition="423px -1px";

}
else if (a== "outils")
{
    document.getElementById(a).style.backgroundPosition="293px -1px";

}
else
{
    document.getElementById(a).style.backgroundPosition="163px -1px";

}

    

}