function menu(){
	var tamp = document.getElementById('menu').style.visibility;
	if (tamp=='hidden') document.getElementById('menu').style.visibility = 'visible';
	else document.getElementById('menu').style.visibility = 'hidden';
}
function popupcentree(page,largeur,hauteur,options) {
	var top=(screen.height-hauteur)/2;
	var left=(screen.width-largeur)/2;
	window.open(page,"site","top="+top+",left="+left+",width="+largeur+",height="+hauteur+",'menubar=1,scrollbars=0,statusbar=no,resizable=no,toolbar=yes'");
}