function preLoadImg(fname) {
	var myImg = new Image();
	myImg.src = fname;
}

preLoadImg("/themes/img/mnu_about_on.gif");
preLoadImg("/themes/img/mnu_infra_on.gif");
preLoadImg("/themes/img/mnu_cott_on.gif");
preLoadImg("/themes/img/mnu_scen_on.gif");
preLoadImg("/themes/img/mnu_climat_on.gif");
preLoadImg("/themes/img/mnu_contacts_on.gif");
preLoadImg("/themes/img/mnu_video_on.gif");