var imgOff = new Array();
var imgOn  = new Array();

function preload(array, prefix, ext) {
	for(var i=0; i<array.length; i++) {
		imgOff[array[i]] = new Image(); 
		imgOff[array[i]].src = prefix + array[i] + (ext || ".gif");	
		imgOn[array[i]]  = new Image(); 
		imgOn[array[i]].src  = prefix + array[i] + "_mo" + (ext || ".gif");
	}
}

var gif = ['home', 'intro', 'bibliography', 'forthcoming', 'reviewed', 'links', 'contact'];
preload(gif, 'images/nav/', '.gif');

function imgOver(name, way, lyr) {
	//var target = (is.NS4)? getObject(lyr).document:document;
	var target = document;
	//target.images[name].src = (way)? imgOn[name].src:imgOff[name].src;
	target.images[name].src = (way)? imgOn[name].src:imgOff[name].src;
}