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(15,11);
        home_off.src="images/home.gif";
        home_on=new Image(15,11);
        home_on.src="images/home2.gif";
		
		mail_off=new Image(13,11);
        mail_off.src="images/mail.gif";
        mail_on=new Image(13,11);
        mail_on.src="images/mail2.gif";
		
		sitemap_off=new Image(16,11);
        sitemap_off.src="images/sitemap.gif";
        sitemap_on=new Image(16,11);
        sitemap_on.src="images/sitemap2.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");
        }}