window.onload = function(){
	var images = new Array();
	var imgs = document.getElementById('nav').getElementsByTagName('img');
	for (var z in imgs) {
		if (typeof imgs[z] == 'object') {
			var oldSrc = imgs[z].src;
			var img = new Image();
			var srcParts = oldSrc.split('.');
			for (var zz = 0; zz <= srcParts.length-2; zz++) {
				var newSrc = srcParts[zz];
			}
			newSrc +='_highlighted.'+srcParts[srcParts.length-1];
			img.src = newSrc;
		
			imgs[z].onmouseover = function(){
				var srcParts = this.src.split('.');
				var ext = srcParts[srcParts.length-1];
				//for (var zz = 0; zz <= srcParts.length-2; zz++) {var newSrc = srcParts[zz];}
				var newSrc = this.src.substring(0, this.src.length - ext.length - 1);
				newSrc +='-highlighted.'+ext;
				this.src = newSrc;
			}
			
			imgs[z].onmouseout = function(){
				this.src = this.src.replace('-highlighted', '');
			}
		}
	}
}