function show(element) {
    var box = document.getElementById(element);
    box.style.visibility = "visible";
    box.style.display = "block";
}
function hide(element){
	var box = document.getElementById(element);
	box.style.visibility = "hidden";			
    box.style.display = "none";			
}
function aendere(element,text) {
	document.getElementById(element).firstChild.nodeValue = text;
}