Search In My Web Site

I like to create a search mechanism in my web site. This
search engine will look for the keyword in my web
directory and return the file location as hyperlink. Now,
I have included all the conent of my web site as include
text file. Example: I have index.asp and content of
index.asp located at include/index.txt. If search query
locates at index.txt I want my search code to return
index.asp instead of index.txt as search result. How can I
do it.