function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		pre_services_over    = newImage('../_imgs/images/services-over.gif');
		pre_realisation_over = newImage('../_imgs/images/realisation-over.gif');
		pre_partenaires_over = newImage('../_imgs/images/partenaires-over.gif');
		pre_hebergement_over = newImage('../_imgs/images/hebergement-over.gif');
		pre_tarifs_over      = newImage('../_imgs/images/tarifs-over.gif');
		pre_contact_over     = newImage('../_imgs/images/contact-over.gif');
		preloadFlag = true;
	}
}


function changeImages(id,ref,num) {
	if (document.images && (preloadFlag == true)) {
		document[id].src = ref;
		//if (num!='') {toggle_menu(num); }
	}
}
function toggle_menu(idrub) {
	var is_visi =   document.getElementById('menu'+idrub).style.display ;
	if (is_visi == 'block') { affichage = 'none';  }else {affichage = 'block'; }
	document.getElementById('menu'+idrub).style.display = affichage ;
}
function show_menu(idrub) {
	document.getElementById('menu'+idrub).style.display = 'block' ;
}
function hide_menu(idrub) {
	document.getElementById('menu'+idrub).style.display = 'none' ;
}