function switchMenu(obj) {
    if(document.getElementById) {
	    var el = document.getElementById(obj);
	    var ar = document.getElementById("left").getElementsByTagName("SPAN");
	    if(el.style.display == "none") {
			for (var i=0; i<ar.length; i++) {
				ar[i].style.display = "none";
			}
			el.style.display = "block";
	    } else {
			el.style.display = "none";
	    }
    }
}
function switchCont(obj) {
	var cont = document.getElementById(obj);
	if(cont.style.display == "none") {
	cont.style.display = "block";
	} else {
	cont.style.display = "none";
	}
}