function clignotement(){
    if (document.getElementById("cligne").style.backgroundImage=="url(images/puce_menu.gif)")
       document.getElementById("cligne").style.backgroundImage="none";
    else
       document.getElementById("cligne").style.backgroundImage="url(images/puce_menu.gif)";	
	}
var a = setInterval("clignotement()", 500);

//_________ Fonction show hide layer ______________
function montre(elem)
{
document.getElementById(elem).style.display="block";
}

function cache(elem)
{
document.getElementById(elem).style.display="none";
}