function imgCache() {
	if (document.images) {
	butt1On = new Image (168,16);
	butt1On.src = "images/resume_2.gif"
	butt1Off = new Image (168,16);
	butt1Off.src = "images/resume_1.gif"
	butt2On = new Image (168,16);
	butt2On.src = "images/portfolio_2.gif"
	butt2Off = new Image (168,16);
	butt2Off.src = "images/portfolio_1.gif"
	butt3On = new Image (168,16);
	butt3On.src = "images/contact_2.gif"
	butt3Off = new Image (168,16);
	butt3Off.src = "images/contact_1.gif"
	butt4On = new Image (168,16);
	butt4On.src = "images/home_2.gif"
	butt4Off = new Image (168,16);
	butt4Off.src = "images/home_1.gif"
	submenu_butt1On = new Image (440,1);
	submenu_butt1On.src = "images/blank_menu.gif"
	submenu_butt2On = new Image (440,1);
	submenu_butt2On.src = "images/blank_menu.gif"
	submenu_butt3On = new Image (440,1);
	submenu_butt3On.src = "images/blank_menu.gif"
	submenu_butt4On = new Image (440,1);
	submenu_butt4On.src = "images/blank_menu.gif"
	submenu_empty = new Image (440,1);
	submenu_empty.src = "images/blank_menu.gif"
	loaded = 1;
		}
	}
	
function menuswapOn (menuName) {
	swapImg(menuName,'On.src');
	swapImg('submenu', '_' + menuName + 'On.src');
	}
	
function menuswapOut (menuName) {
	swapImg(menuName,'Off.src');
	swapImg('submenu', '_empty.src');
	}

function swapImg (imgName, swap) {
	if (loaded == 1) {
		document [imgName].src = eval (imgName + swap);
		}
	}