var sStoreMenuName = "";
var rollovers = new Array();
rollovers['home'] = new RolloverImage(104, 25, "../images/nav_1_on.gif", "../images/nav_1_off.gif");
rollovers['whatwedo'] = new RolloverImage(89, 25, "../images/nav_2_on.gif", "../images/nav_2_off.gif");
rollovers['aboutus'] = new RolloverImage(72, 25, "../images/nav_3_on.gif", "../images/nav_3_off.gif");
rollovers['publications'] = new RolloverImage(60, 25, "../images/nav_4_on.gif", "../images/nav_4_off.gif");
rollovers['resources'] = new RolloverImage(76, 25, "../images/nav_5_on.gif", "../images/nav_5_off.gif");
rollovers['contact'] = new RolloverImage(65, 25, "../images/nav_6_on.gif", "../images/nav_6_off.gif");

function RolloverImage(w, h, on_src, off_src) {
	this.on = new Image(w, h);
	this.on.src = on_src;
	this.off = new Image(w, h);
	this.off.src = off_src;
}

function init(sMenuName) {
	mouseOn(sMenuName);
	sStoreMenuName = sMenuName;
}

function mouseOn(sMenuName) {
	if(sMenuName != sStoreMenuName) {
		document.images[sMenuName].src = rollovers[sMenuName].on.src;
	}
}

function mouseOff(sMenuName) {
	if(sMenuName != sStoreMenuName) {
		document.images[sMenuName].src = rollovers[sMenuName].off.src;
	}
}