Need help in making a custom video upload page

Hi

I am using drupal5.7 .I have created a custom page(using create content -> page) for uploading video.created the page by taking the html source code of the drupal video upload page. When user submits the page I called "node_form_submit" function.But I found that my node table is updated but in the video table the vtype and vidfile is found blank and the file is not uploaded.
Below is the code I am using.Any help will be appreciated

<?php
global $user;
//print_r($_FILES);
if(isset($_POST['op'])) {
$form_val['created'] = time();
$form_val['title'] = $_POST['title'];
$form_val['type'] = 'video';
$form_val['format'] = $_POST['format'];
$form_val['vresolution'] = $_POST['vresolution'];
$form_val['playtime_hours'] = 0;
$form_val['playtime_minutes'] = 0;
$form_val['playtime_seconds'] = 0;
$form_val['video_upload_file'] = "";
$form_val['vidfile'] = "";
$form_val['uid'] = $user->uid; 
$form_val['name'] = $user->name; 
$form_val['revision'] = $_POST['revision'];
$form_val['promote'] = $_POST['promote'];
$form_val['changed'] = $_POST['changed'];
$form_val['sticky'] = $_POST['sticky'];
$form_val['status'] = $_POST['status'];
$form_val['form_tocken'] = $_POST['form_tocken'];
node_form_submit('node-form',$form_val);
}
?>

<form action=""  accept-charset="UTF-8" method="post" id="node-form" enctype="multipart/form-data"> 
<div class="form-item">
 <label for="edit-title">Title: <span class="form-required" title="This field is required.">*</span></label>
 <input type="text" maxlength="128" name="title" id="edit-title"  size="60" value="" class="form-text required" />
</div>
<div class="form-item">

 <label for="edit-video-upload-file">Upload video file: </label>
 <input type="file" name="files[video_upload_file]"  class="form-file" id="edit-video-upload-file" size="40" />

 <div class="description">The uploaded file will be used as video file for this node.<br /><b>NOTE:</b> The max upload size is 2 MB.</div>
</div>
 
<div class="form-item">
 <label for="edit-vresolution">Resolution: <span class="form-required" title="This field is required.">*</span></label>

 <select name="vresolution" class="form-select required" id="edit-vresolution" ><option value="1">4:3 - Television</option><option value="2">16:9 - Widescreen</option></select>
 
</div>
<input type="hidden" name="revision" id="edit-revision" value="0"  />
<input type="hidden" name="promote" id="edit-promote" value="1"  />
<input type="hidden" name="changed" id="edit-changed" value=""  />
<input type="hidden" name="sticky" id="edit-sticky" value="0"  />
<input type="hidden" name="status" id="edit-status" value="1"  />
<input type="hidden" name="form_token" id="edit-video-node-form-form-token" value="<?php print drupal_get_token('node-form'); ?>"  />

<legend>Input format</legend><div class="form-item">
 <label class="option"><input type="radio" name="format" value="1"  checked="checked"  class="form-radio" /> Filtered HTML</label>
</div>

<div class="form-item">
 <label class="option"><input type="radio" name="format" value="2"   class="form-radio" /> PHP code</label>
 <input type="submit" name="op" id="edit-submit" value="Submit"  class="form-submit" />
</div>
</form>