To install:
First, make sure you have installed phptemplate. The given patch is against
the distribution box_grey theme.

1) Create directory taxonomy_dropmenu under Drupal modules/ directory.
2) Copy taxonomy_dropmenu.{module,js,css} to it
3) Apply the given patch to your box_grey page.tpl.php
4) On your Drupal site, go to administer > modules and enable 
   taxonomy_dropmenu module.
5) Go to administer > settings > taxonomy_dropmenu and select with
   vocabularies you wish a dropdown menu get generated.
