Thanks for the reply zztush,
there are two problems with that method. First of all, for pdf files, most of the time there is no linked table of content. I mean there is a table of content, but I cannot choose a chapter in it to take me to that chapter. it is like the rest of the text. simple text. The second problem is I have huge pdf files, like 100 pages in a chapter, and still going to a specific page is almost impossible without turning 10 or 20 pages.