Search only category x or categories x,y,z

i found this
http://mywordpress.ru/plugins/search-in-category/

and translated
http://translate.google.ca/translate?u=http%3A%2F%2Fmywordpress.ru%2Fplugins%2Fsearch-in-category%2F&sl=ru&tl=en&hl=en&ie=UTF-8

just need to review the code
is that a real Russian wp site?

thanks but the search everything in an inclusive search, where as i need more of a restricted search on a per page basis, so if i am in the news-funny category the search option by default searches only that category and any child categories, but by the user clicking a checkbox (for example) the search is site wide or vice versa default is site wide check to search only category xyz

i think the search in category plugin is a good place for me to start, not too good with php, but I’ll see what i can get with some code tweaking

thanks again