Thanks to Pat Roncevich for pointing this one out. It's a website where you create a 'bookmarklet' for your library. You can then position the bookmarklet on your links toolbar and use it to find out if a book you want is available in Pittcat.
Go to the website called the Library Lookup Bookmarklet Generator. In the box for "Base URL
(Example: http://ksclib.keene.edu)" enter http://pittcat.pitt.edu and in the box "Library Name" enter "Barco". Check the box for "Voyager" and Hit "ENTER".
On the next page you can drag the bookmarklet link "Barco" and drop it on your toolbar.
Now the next time you're on Amazon or some other bookseller website and see a book you would like to read, just click on the Barco bookmarklet and it will look up the availability of the book on Pittcat.