Forum:Imputbox prefix

Hello! I added a search box to my talk page with this code: I used the prefix "User_talk:Leviathan_89/Archive_" because my Archives are named "Archive_YEAR-MONTH" like "Archive_2011-06" but when I do a search, it searches not only in my talk page but in the other users talk pages as well. I read here that the parameter "prefix" "only works with certain search backends, currently only latest Extension:lucene-search". May I assume that the "prefix" parameter is not supported? (though in the browser address bar " " is added) How can I make a search box only for my talk page and my archives?