nav_approach_off = new Image();
nav_approach_off.src = "img/nav_approach_off.gif";
nav_approach_on = new Image();
nav_approach_on.src = "img/nav_approach_on.gif";

nav_ba_off = new Image();
nav_ba_off.src = "img/nav_ba_off.gif";
nav_ba_on = new Image();
nav_ba_on.src = "img/nav_ba_on.gif";

nav_background_off = new Image();
nav_background_off.src = "img/nav_background_off.gif";
nav_background_on = new Image();
nav_background_on.src = "img/nav_background_on.gif";

nav_contact_off = new Image();
nav_contact_off.src = "img/nav_contact_off.gif";
nav_contact_on = new Image();
nav_contact_on.src = "img/nav_contact_on.gif";

nav_portfolio_off = new Image();
nav_portfolio_off.src = "img/nav_portfolio_off.gif";
nav_portfolio_on = new Image();
nav_portfolio_on.src = "img/nav_portfolio_on.gif";

function changeImage(image,mode) {
	document[image].src = eval(image + "_" + mode + ".src");
}