function contact_over() {
	document.images["contact"].src = "images/contactez-nous-on.gif";
}
function contact_out() {
	document.images["contact"].src = "images/contactez-nous.gif";
}

function popupcentree(page,largeur,hauteur,options)
{
var top=(screen.height-hauteur)/2;
var left=(screen.width-largeur)/2;
window.open(page,"","top="+top+",left="+left+",width="+largeur+",height="+hauteur+","+options);
}