/** generic img mouseover function
* <a href="#" onmouseover="mo(this,'images/mouseover.gif')" onmouseout="mo(this,'')">
*     <img src="image/standard.gif" alt="alt">
* </a>
*/
function mo(obj, url) {
	var moimgs;
	if (this.moimgs == null) this.moimgs = new Array();
	if (url != '') {
		var oldurl = obj.getElementsByTagName("img")[0].src;
		obj.getElementsByTagName("img")[0].src=url;
		url = obj.getElementsByTagName("img")[0].src; // take what the browser will make of it
		this.moimgs[url] = oldurl;
	} else {
		obj.getElementsByTagName("img")[0].src=this.moimgs[obj.getElementsByTagName("img")[0].src];
	}
}