browserName=navigator.appName;
browserVer=parseInt(navigator.appVersion);
if (browserName=="Netscape" && browserVer >= 3) version="Ok";
        else if (browserName=="Microsoft Internet Explorer" && browserVer >= 4) version="Ok";
                else version="Err";
if (version=="Ok") {

   	home_off=new Image(53,41);
        home_off.src="../images/home.gif";
        home_on=new Image(53,41);
        home_on.src="../images/home2.gif";
		
		mail_off=new Image(53,44);
        mail_off.src="../images/mail.gif";
        mail_on=new Image(53,44);
        mail_on.src="../images/mail2.gif";
		
        }
function UrlOn(ImageName) {
        if (version=="Ok") {
        image_on=eval(ImageName + "_on.src");
        document.images[ImageName].src=image_on;
        }}
function UrlOff(ImageName) {
        if (version=="Ok") {
        document.images[ImageName].src=eval(ImageName + "_off.src");
        }}