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") {

   			somateio_off=new Image(171,30);
        somateio_off.src="/images/somatio.gif";
        somateio_on=new Image(171,30);
        somateio_on.src="/images/somatio2.gif";
		
				news_off=new Image(171,30);
        news_off.src="/images/news.gif";
        news_on=new Image(171,30);
        news_on.src="/images/news2.gif";
		
				articles_off=new Image(171,30);
        articles_off.src="/images/arthra.gif";
        articles_on=new Image(171,30);
        articles_on.src="/images/arthra2.gif";
		
				newsletter_off=new Image(171,30);
        newsletter_off.src="/images/newsletter.gif";
        newsletter_on=new Image(171,30);
        newsletter_on.src="/images/newsletter2.gif";
		
				contact_off=new Image(171,30);
        contact_off.src="/images/contact.gif";
        contact_on=new Image(171,30);
        contact_on.src="/images/contact2.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");
        }}