/*
Blocca la propagazione dell'evento (e) 
*/
function stopPropagationFunction (e)
{

	if(e && e.stopPropagation) {
		if(e.stopPropagation) e.stopPropagation();
		if(e.preventDefault) e.preventDefault();
    	e.returnValue = false; // Cancels default action. opera
	}else{
		if(!e) e = window.event;
    	e.returnValue = false; // Cancels default action. explorer
    	e.cancelBubble = true;
	};
	return false;
}