function validaEmail (email){
    return new RegExp(/^[A-Za-z0-9_\-\.]+@[A-Za-z0-9_\-\.]{2,}\.[A-Za-z0-9]{2,}(\.[A-Za-z0-9])?/).test(email);
}

function trim(string){
    return string.replace(/^\s+|\s+$/g,"");
}