<!-- Google Analytics -->
var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
try {
var pageTracker = _gat._getTracker("UA-5100243-3");
pageTracker._trackPageview();
} catch(err) {}
<!-- menu -->
function switchmenu(obj){
        if(document.getElementById){
        var el = document.getElementById(obj);
        var ar = document.getElementById("maindiv").getElementsByTagName("span"); 
                if(el.style.display != "block"){
                        for (var i=0; i<ar.length; i++){
                                if (ar[i].className=="submenu") 
                                ar[i].style.display = "none";
                        }
                        el.style.display = "block";
                }else{
                        el.style.display = "none";
                }
        }
}
<!-- show,hidden -->
function exchange(show,hidden){
if(document.getElementById(show).style.display = 'none'){
document.getElementById(show).style.display = 'block';
document.getElementById(hidden).style.display = 'none';
}
}