You can also use gallery, that you created in the wp administration, on external websites.

Screencast

Usage

Therefore go to the “Options” page, choose the gallery you would like to use and customize the options for it.

When you are done, simply hit the “Generate Code” button. On the next page you have to copy the code for the head and body area in your HTML document. Just paste the copied lines in your HTML document and you are done.

Code Generator