if (document.images) {

	img1on = new Image();
	img1on.src = "./images/menu_1_on.gif";
	img1off = new Image();
	img1off.src = "./images/menu_1_off.gif";

	img2on = new Image();
	img2on.src = "./images/menu_2_on.gif";
	img2off = new Image();
	img2off.src = "./images/menu_2_off.gif";

	img3on = new Image();
	img3on.src = "./images/menu_3_on.gif";
	img3off = new Image();
	img3off.src = "./images/menu_3_off.gif";

	img4on = new Image();
	img4on.src = "./images/menu_4_on.gif";
	img4off = new Image();
	img4off.src = "./images/menu_4_off.gif";

	img5on = new Image();
	img5on.src = "./images/menu_5_on.gif";
	img5off = new Image();
	img5off.src = "./images/menu_5_off.gif";
	
	img6on = new Image();
	img6on.src = "./images/menu_6_on.gif";
	img6off = new Image();
	img6off.src = "./images/menu_6_off.gif";
	
	img7on = new Image();
	img7on.src = "./images/menu_7_on.gif";
	img7off = new Image();
	img7off.src = "./images/menu_7_off.gif";
	
	img8on = new Image();
	img8on.src = "./images/menu_8_on.gif";
	img8off = new Image();
	img8off.src = "./images/menu_8_off.gif";
}

function imgOn(imgName) {
        if (document.images) {
            document[imgName].src = eval(imgName + "on.src");
        }
}

function imgOff(imgName) {
        if (document.images) {
            document[imgName].src = eval(imgName + "off.src");
        }
}