$form_id = 'ad_node_form';

$field_values['uid'] = 1;
$field_values['type'] = 'ad';
$field_values['format'] = 2;
$field_values['adtype'] = 'image';
$field_values['adstatus'] = 'active';
$field_values['name'] = 'admin';
$field_values['status'] = 1;
$field_values['promote'] = 0;
$field_values['sticky'] = 0;
$field_values['revision'] = 0;
$field_values['op'] = 'Submit';
$field_values['submit'] = 'Submit';
$field_values['form_token'] = 'f3865d34d354db0c311e298403bc5fa9';
$field_values['form_id'] = 'ad_node_form';
$field_values['comment'] = 0;
$field_values['pathauto_perform_alias'] = 1;

$field_values['title'] = 'zzzzzz2';
$field_values['url'] = 'http://monkey2.com';
$field_values['tooltip'] = 'mouseover2';

$field_values['taxonomy'][] = 5;
$field_values['taxonomy'][] = 238;

$field_values['files']['upload_0']['description'] = '428photo.gif';
$field_values['files']['upload_0']['remove'] = 0;
$field_values['files']['upload_0']['list'] = 1;
$field_values['files']['upload_0']['filename'] = '428photo.gif';
$field_values['files']['upload_0']['filepath'] = 'C:\xampp_oldmysql\tmp\428photo.gif';
$field_values['files']['upload_0']['filemime'] = 'image/gif';
$field_values['files']['upload_0']['filesize'] = 10817;
$field_values['files']['upload_0']['fid'] = 'upload_0';

$retval = drupal_execute( $form_id, $field_values );



===========================================

/*
$form_id = 'ad_node_form';

$field_values = array();

$field_values['user_name'] = 'abc';
$field_values['monkey'] = 'joe';

$retval = drupal_execute( $form_id, $field_values );
echo $retval

*/



(
    [nid] => 
    [vid] => 
    [uid] => 1
    [created] => 1219456120
    [type] => ad
    [changed] => 
    [aid] => 
    [title] => zzzzzz
    [body] => 
    [format] => 2
    [url] => http://monkey.com
    [tooltip] => mouseover
    [adtype] => image
    [adstatus] => active
    [autoactivate] => 
    [autoexpire] => 
    [maxviews] => 
    [maxclicks] => 
    [log] => 
    [name] => admin
    [date] => 2008-08-22 19:35:04 -0600
    [status] => 1
    [promote] => 0
    [sticky] => 0
    [revision] => 0
    [preview] => Preview
    [op] => Submit
    [submit] => Submit
    [form_token] => f3865d34d354db0c311e298403bc5fa9
    [form_id] => ad_node_form
    [comment] => 0
    [menu] => Array
        (
            [title] => 
            [description] => 
            [pid] => 1
            [path] => 
            [weight] => 0
            [mid] => 0
            [type] => 86
        )

    [path] => 
    [pathauto_perform_alias] => 1
    [taxonomy] => Array
        (
            [2] => Array
                (
                    [5] => 5
                )

            [4] => Array
                (
                    [238] => 238
                )

        )

    [files] => Array
        (
            [upload_0] => Array
                (
                    [description] => 1sthealthcenter.gif
                    [remove] => 0
                    [list] => 1
                    [filename] => 1sthealthcenter.gif
                    [filepath] => C:\xampp_oldmysql\tmp\tmp3B71.tmp
                    [filemime] => image/gif
                    [filesize] => 5054
                    [fid] => upload_0
                )

        )

    [upload] => 
    [attach] => Attach
    [attach-url] => http://drupalbook.local/upload/js
    [nodewords] => Array
        (
            [description] => 
            [keywords] => 
        )