// JavaScript Document
//------- VARIABILI -------------
var currentElementNumber = 1;
var elementoPadre = 1;
var elementoFiglio = 1;
var selectClassName = "sel";
var elementName = "#tabItem";

//------- FUNZIONI -------------
//nascondo il contenuto corrente e mostro quello selezionato
function changeContent(elNumber) {
		elementoPadre = left(elNumber,1);
		elementoFiglio = elNumber;
		hideElement(currentElementNumber)
		showElement();
		currentElementNumber = elementoFiglio;
}

function showElement() {
	$("#content"+elementoFiglio).removeClass("displayNone");
	$("#"+elementName+elementoPadre).addClass(selectClassName);
}

function hideElement(elementNumber) {
	$("#content"+elementNumber).addClass("displayNone");
	$("#"+elementName+left(elementNumber,1)).removeClass(selectClassName);
}

function left(str, n)
{
   if (n <= 0)
         return "";
   else if (n > String(str).length)
         return str;
   else
         return String(str).substring(0,n);
}