function validarEmail(email) {    
    return (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(email));
}

function validarNickUsuario(nick)
{
    var spchar = "`'()(\\~!@^&*+\"|%:;_-[]{}=,<> ";
    var i, j;
    for(i=0; i < nick.length; i++)
    {
        for(j=0; j < spchar.length; j++)
        {	                
            if(nick.charAt(i)== spchar.charAt(j))
                return false;
        }
    }
    return true;
}