solved Javascript Form Message

id="{$form_name}_msg"

    $_tmp = array(
        'name'      => 'profile_id',
        'label'     => 'profile name',
        'type'      => 'live_search',
        'help'      => 'Select the profile to reset the business settings for',
        'validate'  => 'not_empty',
        'required'  => true,
        'error_msg' => 'You have selected an invalid Profile - please try again',
        'target'    => jrCore_get_base_url() . "/{$_post['module_url']}/search_business_profiles"
    );
    jrCore_form_field_create($_tmp);

jrCore_alert('this is an alert message, but pretty')

// set a notice in php
 jrCore_set_form_notice('error', 'invalid something');
// get any notices that were set
 jrCore_get_form_notice();

/**
 * Set the contents of the argument form message_id to message as an error or success
 * @param {string}  message_id - the HTML id of the element containing the message
 * @param {string}  message - the HTML to include as the message
 * @param {boolean} error - if true, mark this as an error message
 */
function ntCore_set_form_message(message_id, message, error){
    var selector = '#'+message_id;

    if ($(selector).length)                                             // ensure message_id element exists
    {
        if (typeof error === 'undefined' || error == false)
                $(selector).html(message).removeClass('error').show();
        else $(selector).html(message).addClass('error').show();
    }
}

function xxSomething_show_error_message(){
    $('.my_error_message').remove();
    $('.form_submit_box').prepend('<div class="my_error_message page_notice error">Some message before the SUBMIT button</div>');
}