if (document.getElementById){
        document.write('<style type="text/css">')
        document.write('.submenu{display:none;}')
        document.write('</style>')
}

function SwitchMenu(obj){
	if (document.getElementById){
    	        var el = document.getElementById(obj);
   	        var ar = document.getElementById("navdiv").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";
                }
         }
}