getting values from radio boxes

[c_pattle]

I have a form that contains radio buttons and when it is submitted the content of the form are added to a database.  I was wondering how you get the values of radio boxes when submitting the form.  I have the following radio buttons and when submitting I use "$_POST['article_type']" but this doesn't seem to work.  Thanks for any help. 

 

<label>PDF Article</label><input name="article_type" value="pdf" type="radio" />
<label>Video Webcast</label><input name="article_type" value="webcast" type="radio" />
<label>Podcast</label><input name="article_type" value="podcast" type="radio" />

[jskywalker]

If you save this code in a file named 'check.php' this works:

 

<?php
print_r($_POST);
?>

<HR>

<FORM METHOD="POST" ACTION="check.php">
<input type="submit" value="submit">

<label>PDF Article</label><input name="article_type" value="pdf" type="radio" />
<label>Video Webcast</label><input name="article_type" value="webcast" type="radio" />
<label>Podcast</label><input name="article_type" value="podcast" type="radio" />

</form>

 

which part am i missing ?