nav = (((navigator.appName == "Netscape") && (parseInt(navigator.appVersion) >=4 )) ||
       ((navigator.appName == "Microsoft Internet Explorer") && (parseInt(navigator.appVersion) >=4 )));

if (nav) 
{
 str = new Array();
 str.length = 12;
 for (var x=1; x<=12; x++) { str[x] = new Image(); }

 str[01].src = 'images/menu-1.gif';
 str[02].src = 'images/menu-1b.gif';
 str[03].src = 'images/menu-2.gif';
 str[04].src = 'images/menu-2b.gif';
 str[05].src = 'images/menu-3.gif';
 str[06].src = 'images/menu-3b.gif';
 str[07].src = 'images/menu-4.gif';
 str[08].src = 'images/menu-4b.gif';
 str[09].src = 'images/menu-5.gif';
 str[10].src = 'images/menu-5b.gif';
 str[11].src = 'images/menu-6.gif';
 str[12].src = 'images/menu-6b.gif';
}

if (nav)
{
function look(target, item)
{
 lasttrg = target;
 document.images[lasttrg].src =  str[item+1].src;
}}

function hide(item)
{
if (nav) 
{
 document.images[lasttrg].src = str[item].src;
}}