function Show(id,dove){
	Hideallsub();
	var newPos = findPos(dove);
	if(document.getElementById){
		var el=document.getElementById(id);
		var el2=document.getElementById(dove);
		el.style.display = "block";
		el.style.left = newPos[0]-6+"px";
		el.style.top = newPos[1]+22+"px";
		el2.style.backgroundImage = 'img/menu-arrow.gif';
		el2.style.backgroundPosition = 'bottom center';
		el2.style.backgroundRepeat = 'no-repeat';
	}
}
function Hide(id){
	if(document.getElementById){
		var el=document.getElementById(id);
		el.style.display = "none";
	}
}
function Hideallsub(){
	for (var i=0;i<idSub.length;i++){
		Hide(idSub[i]);
	}		  
}
function findPos(obj) {
	var curleft = curtop = 0;
	var el=document.getElementById(obj);
	if (el.offsetParent) {
		curleft = el.offsetLeft;
		curtop = el.offsetTop;
		while (el = el.offsetParent) {
			curleft += el.offsetLeft;
			curtop += el.offsetTop;
		}
	}
	return [curleft,curtop];
}
function Muovi(){
	Show('tab5','a5')
}