// load all menu images
function loadMenuImages() {

      if (document.images) {

		home_on = new Image();
		home_on.src = "images/home_on.gif";
		aboutus_on = new Image();
		aboutus_on.src = "images/aboutus_on.gif";
		contact_on = new Image();
		contact_on.src = "images/contact_on.gif";
		activities_on = new Image();
		activities_on.src = "images/activities_on.gif";
		tvshow_on = new Image();
		tvshow_on.src = "images/tvshow_on.gif";
		members_on = new Image();
		members_on.src = "images/members_on.gif";
		photos_on = new Image();
		photos_on.src = "images/photos_on.gif";
		links_on = new Image();
		links_on.src = "images/links_on.gif";
		tiengviet_on = new Image();
		tiengviet_on.src = "images/tiengviet_on.gif";

		home_off = new Image();
		home_off.src = "images/home_off.gif";
		aboutus_off = new Image();
		aboutus_off.src = "images/aboutus_off.gif";
		contact_off = new Image();
		contact_off.src = "images/contact_off.gif";
		activities_off = new Image();
		activities_off.src = "images/activities_off.gif";
		tvshow_off = new Image();
		tvshow_off.src = "images/tvshow_off.gif";
		members_off = new Image();
		members_off.src = "images/members_off.gif";
		photos_off = new Image();
		photos_off.src = "images/photos_off.gif";
		links_off = new Image();
		links_off.src = "images/links_off.gif";
		tiengviet_off = new Image();
		tiengviet_off.src = "images/tiengviet_off.gif";
		
		trangchinh_on = new Image();
		trangchinh_on.src = "images/trangchinh_on.gif";
		gioithieu_on = new Image();
		gioithieu_on.src = "images/gioithieu_on.gif";
		lienlac_on = new Image();
		lienlac_on.src = "images/lienlac_on.gif";
		sinhhoat_on = new Image();
		sinhhoat_on.src = "images/sinhhoat_on.gif";
		hoivien_on = new Image()
		hoivien_on.src = "images/hoivien_on.gif";
		hinhanh_on = new Image();
		hinhanh_on.src = "images/hinhanh_on.gif";
		noiket_on = new Image();
		noiket_on.src = "images/noiket_on.gif";		
		english_on = new Image();
		english_on.src = "images/english_on.gif";

		trangchinh_off = new Image();
		trangchinh_off.src = "images/trangchinh_off.gif";
		gioithieu_off = new Image();
		gioithieu_off.src = "images/gioithieu_off.gif";
		lienlac_off = new Image();
		lienlac_off.src = "images/lienlac_off.gif";
		sinhhoat_off = new Image();
		sinhhoat_off.src = "images/sinhhoat_off.gif";
		hoivien_off = new Image()
		hoivien_off.src = "images/hoivien_off.gif";
		hinhanh_off = new Image();
		hinhanh_off.src = "images/hinhanh_off.gif";
		noiket_off = new Image();
		noiket_off.src = "images/noiket_off.gif";
		english_off = new Image();
		english_off.src = "images/english_off.gif";		
	}
}
        

// Function to 'activate' images.
function imgOn(imgName) {
    if (document.images) {
        document[imgName].src = eval(imgName + "_on.src");
    }
}

// Function to 'deactivate' images.
function imgOff(imgName) {
    if (document.images) {
        document[imgName].src = eval(imgName + "_off.src");
    }
}