var timeout         = 500;
var closetimer		= 0;
var ddmenuitem      = 0;
var ddmenuitemclick = '';

// open hidden layer
// Merzi-Bileddo: aggiunta su evento click per funzionamento con tap iPad
function mclick(id)
{	
	// get new layer and show it
    if (id == ddmenuitemclick) {
 
    	mclose()
    	ddmenuitemclick = '';
    } else {
		ddmenuitemclick = id;
		mopen(id)
	}
}

// open hidden layer
function mopen(id)
{	
	// cancel close timer
	mcancelclosetime();

	// close old layer
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';

	// get new layer and show it
	ddmenuitem = document.getElementById(id);
	ddmenuitem.style.visibility = 'visible';

}
// close showed layer
function mclose()
{
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
}

// go close timer
function mclosetime()
{
	closetimer = window.setTimeout(mclose, timeout);
}

// cancel close timer
function mcancelclosetime()
{
	if(closetimer)
	{
		window.clearTimeout(closetimer);
		closetimer = null;
	}
}

// close layer when click-out
// tolto per aprire menu su Tap con iPad
//document.onclick = mclose;