What AltaVista cant index
Password-protected sites;
Content from a database (dynamic pages);
Active server pages (asp) with "?" in their URLs; (Note: The engine can index URLs with "?" in them if submitted manually.)
Has problems with frames;
Text embedded in graphics;
Text in multimedia files;
Information that is generated by Java applets or in XML coding;
Acrobat files;
Comment tags;
Information that's deeper than three directory levels down; name
here is an article that might help you
http://www.samizdat.com/script/title.htm