The way I do it you'll need these requirements:
- bg image
- host with PHP
- GD library installed with PHP (not all hosts have it
So if you don't have those, you won't be able to do it, at least this way. I'd rather not go through the process of doing it all. I tend to think it something precious, because I was able to get it to work on my own, and would rather leave it at being something of my own. Not something everyone else has
