function noenter(field, event) {
    var keyCode = event.keyCode ? event.keyCode : event.which
                      ? event.which : event.charCode;
    if (keyCode == 13) {
        var i;
        for (i = 0; i < field.form.elements.length; i++)
            if (field == field.form.elements[i])
                break;
        i = (i + 1) % field.form.elements.length;
        field.form.elements[i].focus();
        return false;
    } 
    else
        return true;
}