If you're looking for a solution to offload your images from your server to another.

*You should be looking at Image Storage APIs.
*Imageshack probably has an API for you to do it.
*Picasa also has an API for you to upload and retrieve photos.
*Perhaps it doesn't even have to be an image storage API.
*storage APIs and I think box.net offers them.
*SMEStorage as combination packages.

*Usually if their provide APIs, it comes with code samples on how to use them.

*You build the UPLOAD form.
The UPLOAD form retrieves image from USER.
The UPLOAD form sends the image via these API to their SERVER.
The SERVER returns you the URL LINK of the image.
You STORE the URL LINK into your DATABASE."