// Image swap

function swap(myimg) {
	var suffix = myimg.src.substring(myimg.src.lastIndexOf('.'));
	myimg.src = myimg.src.substring(0,myimg.src.lastIndexOf('.')) + "_r" + suffix;
	}
function restore(myimg) {
	myimg.src = myimg.src.replace("_r","");
	}



var W3CDOM = (document.createElement && document.getElementsByTagName);

var mouseOvers = new Array();
var mouseOuts = new Array();

function init() {
	if (!W3CDOM) return;
	
var nav = document.getElementById('nav');
	var imgs = nav.getElementsByTagName('img');
	for (var i=0;i<imgs.length;i++)
	{
		if (imgs[i].src.match("_r.gif") == null) {
		imgs[i].onmouseover = mouseGoesOver;
		imgs[i].onmouseout = mouseGoesOut;
		var suffix = imgs[i].src.substring(imgs[i].src.lastIndexOf('.'));
		mouseOuts[i] = new Image();
		mouseOuts[i].src = imgs[i].src;
		mouseOvers[i] = new Image();
		mouseOvers[i].src = imgs[i].src.substring(0,imgs[i].src.lastIndexOf('.')) + "_r" + suffix;
		imgs[i].number = i;
		}
	}
	

}

function mouseGoesOver() {
	this.src = mouseOvers[this.number].src;
}

function mouseGoesOut() {
	this.src = mouseOuts[this.number].src;
}