I am trying without success to customize or combine the drupal 6.x keyword search function with category (taxonomy). The search could be the core site-wide module that comes with the drupal build, or any other custom modules, like Autocomplete Node Finder. it is going to be something like:

search: [__________] [category list dropdown menu] [V]

I think there are two ways of doing this: 1) modify the Category Browser code to include a keyword search, or 2) incorporate the keyword module with Taxonomy Browser... But I am not sure if that is the right way to do for drupal and how ...
Could anybody give me some help in this regard please? thanks!!
hujia