img1on = new Image(); img1on.src = "images/button_blue_contactus.jpg";
img2on = new Image(); img2on.src = "images/button_blue_aboutus.jpg";
img3on = new Image(); img3on.src = "images/button_blue_home.jpg";

img1off = new Image(); img1off.src = "images/button_black_contactus.jpg";
img2off = new Image(); img2off.src = "images/button_black_aboutus.jpg";
img3off = new Image(); img3off.src = "images/button_black_home.jpg";

function imgOn(w) {
	document.images[w].src = eval(w + "on.src");
	}
function imgOff(w) {
	document.images[w].src = eval(w + "off.src");
	}