[Yang Xu]

In the categories.tpl file, there are codes to get all the categories. You can copy the code and put into the search.tpl files to create pull-down menu.

But frankly I don't like the idea. Because the categories are nested. If you put all the categories in pull down menu, they will be in the same level. It is not very organized.

Also if you have a lot of categories, the pull down menu will be very long and kind of mess.