Blog Archives List Not Working

I am using the following code to produce a dropdown menu of archived posts:

<form name="archiveform" action="">
<select name="archive_chrono" onchange="window.location = (document.forms.archiveform.archive_chrono[document.forms.archiveform.archive_chrono.selectedIndex].value);">
<option value=''>Select Month:</option>
<?php wp_get_archives('format=option'); ?>
</select>
</form>

[Please post code & markup between backticks or use the code button. Your posted code may now have been permanently damaged by the forum’s parser.]

You’ll notice that at the bottom of my left sidebar the only option available when the dropdown menu is clicked is ‘Select Month:’

http://www.thefeaturedcreature.com/

Any idea why this dropdown menu isn’t grabbing the archives for selection by month?

Thanks