// SUBMIT POR ENTER
function submitenter(myfield,e){
    var keycode;
    if (window.event) keycode = window.event.keyCode;
    else if (e) keycode = e.which;
    else return true;

    if (keycode == 13)
       {
       myfield.form.submit();
       return false;
       }
    else
       return true;
}