//+ Carlos R. L. Rodrigues
//@ http://jsfromhell.com/geral/event-listener [rev. #5]

addEvent = function(o, e, f, s){
    var r = o[r = "_" + (e = "on" + e)] = o[r] || (o[e] ? [[o[e], o]] : []), a, c, d;
    r[r.length] = [f, s || o], o[e] = function(e){
        try{
            (e = e || event).preventDefault || (e.preventDefault = function(){e.returnValue = false;});
            e.stopPropagation || (e.stopPropagation = function(){e.cancelBubble = true;});
            e.target || (e.target = e.srcElement || null);
            e.key = (e.which + 1 || e.keyCode + 1) - 1 || 0;
        }catch(f){}
        for(d = 1, f = r.length; f; r[--f] && (a = r[f][0], o = r[f][1], a.call ? c = a.call(o, e) : (o._ = a, c = o._(e), o._ = null), d &= c !== false));
        return e = null, !!d;
    }
};

removeEvent = function(o, e, f, s){
    for(var i = (e = o["_on" + e] || []).length; i;)
        if(e[--i] && e[i][0] == f && (s || o) == e[i][1])
            return delete e[i];
    return false;
};

function validaEmail(email)
{
  if (!(/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(email))) {
    return false;
  } else {
    return true;
  }
}