// 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');
     if(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;
}