Go to this site
www.codefundamentals.com/portfolio.php
View the soruce and look at hte head section. I have a jQery file and a lightbox file. Copy those two code files.
Go to your index.html folder. Create the two file names of those two scripts I had you copy (jquery file and lightbox) and past the code in. You can move these files to a different folder later on if you want.
Just copy what my website did basically.