function switchMenu(obj, obj2, obj3)
{
    var el = document.getElementById(obj);
    var el2 = document.getElementById(obj2);
    var el3 = document.getElementById(obj3);
    if
    (el.style.display != "none")
    {
	    el.style.display = 'none';	
	    el2.style.display = '';
	    el3.style.display = 'none';    
    }
    else
    {
	    el.style.display = '';
	    el2.style.display = 'none';
	    el3.style.display = '';
    }
}