var img = new Array();
var loaded = false;

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

function load() {
	img['homepage'] = pre('img/menu_homepage.gif');
	img['homepage_on'] = pre('img/menu_homepage_on.gif');
	img['aboutus'] = pre('img/menu_aboutus.gif');
	img['aboutus_on'] = pre('img/menu_aboutus_on.gif');
	img['ourfacilities'] = pre('img/menu_ourfacilities.gif');
	img['ourfacilities_on'] = pre('img/menu_ourfacilities_on.gif');
	img['ourservices'] = pre('img/menu_ourservices.gif');
	img['ourservices_on'] = pre('img/menu_ourservices_on.gif');
	img['completedprojects'] = pre('img/menu_completedprojects.gif');
	img['completedprojects_on'] = pre('img/menu_completedprojects_on.gif');
	img['bathroomgallery'] = pre('img/menu_bathroomgallery.gif');
	img['bathroomgallery_on'] = pre('img/menu_bathroomgallery_on.gif');
	img['recentprojects'] = pre('img/menu_recentprojects.gif');
	img['recentprojects_on'] = pre('img/menu_recentprojects_on.gif');
	img['workinprogress'] = pre('img/menu_workinprogress.gif');
	img['workinprogress_on'] = pre('img/menu_workinprogress_on.gif');
	img['contactus'] = pre('img/menu_contactus.gif');
	img['contactus_on'] = pre('img/menu_contactus_on.gif');
	loaded = true;
}

function on(arg) {
	if (loaded) {
		document.images[arg].src = img[arg+'_on'].src;
	}
	return true;
}

function off(arg) {
	if (loaded) {
		document.images[arg].src = img[arg].src;
	}
	return true;
}