window.onload = function() {
	MM_preloadImages('images/intro-menu1b.gif', 'images/intro-menu2b.gif', 'images/intro-menu3b.gif', 'images/intro-menu4b.gif');
	survol();
}

function survol() {
	AddEvent("aMenu1", "Menu1", "1");
	AddEvent("aMenu2", "Menu2", "2");
	AddEvent("aMenu3", "Menu3", "3");
	AddEvent("aMenu4", "Menu4", "4");
}

function AddEvent(IdName, Ida, img) {
	id = document.getElementById(IdName);
	id.onmouseover = function() {
		MM_swapImage(Ida,'','images/intro-menu' + img + 'b.gif',1);
	}

	id.onmouseout = function () {
		MM_swapImgRestore();
	}
}