function ShowHide(id){
if(document.getElementById){
    var el=document.getElementById(id);
    el.style.display = (el.style.display=="block") ? "none" : "block";
    }
}

function HideMenu(id){
if(document.getElementById){
    var el=document.getElementById(id);
    el.style.display = "none";
    }
}

function posiziona(id_elemento, top, left) {
  var elemento = document.getElementById(id_elemento);
  var is_explorer = (navigator.userAgent.indexOf("MSIE")>=0) ? true : false;
  var posLeft = (is_explorer) ? document.documentElement.scrollLeft : pageXOffset
  var posTop = (is_explorer) ? document.documentElement.scrollTop : pageYOffset
  elemento.style.left = parseInt(posLeft) + left + "px";
	if (posTop>top){
		elemento.style.top = posTop + 70 + "px";
	} else {
		elemento.style.top = 0 + top + "px";
	}
}