var mainOverImage = new Image(); mainOverImage.src = "img/page/button-on.gif";
var mainOutImage = new Image(); mainOutImage.src = "img/page/button-off.gif";

var subOverImage = new Image(); subOverImage.src = "img/page/subbutton-on.gif";
var subOutImage = new Image(); subOutImage.src = "img/page/subbutton-off.gif";

var homeOverImage = new Image(); homeOverImage.src = "img/home/button-on.gif";
var homeOutImage = new Image(); homeOutImage.src = "img/home/button-off.gif";

function HON(name){
	if (document.images) { document.images[name].src = homeOverImage.src; }
}
function HOF(name){
	if (document.images) { document.images[name].src = homeOutImage.src; }
}

function MON(name){
	if (document.images) { document.images[name].src = mainOverImage.src; }
}
function MOF(name){
	if (document.images) { document.images[name].src = mainOutImage.src; }
}

function SON(name){
	if (document.images) { document.images[name].src = subOverImage.src; }
}
function SOF(name){
	if (document.images) { document.images[name].src = subOutImage.src; }
}