will something like this...

[adelea]

Looks fairly simple and should be easy to implement.

All it looks like it is, is a frame for the player health, then a number of frames afterwards which correspond to spells, and cast the spell on the relevant player when clicked.

It would however, have a few limitations. The biggest being you couldnt add/remove/move things if you were in combat - so you would have to make sure it was in a good location first!