I just wanted to give you a heads up this time that I added another tutorial (for adding multiple characters this time).
Also, just so you don't think I've given up on the mouse thing, I figured I'd give you a small update. I've somewhat got it figured out, I just need to work on the paramaters. I think I'll have to input a separate method, which will check for every instance of signs that you want to click on. The method used to get mouse input checks the x,y position, and from there the size of the area that should be clickable (in a square). The parameters check only one spot, so if you have more than one sign in your game (and...surely you do...), you'll have to include a check for that sign and the current map. It shouldn't be too hard, just a lot of copy/pasting and changing the parameters. Once I get a better handle on it, I'll give you more details on how to do it.