Help with code

Well i'm currently working on a strategy rpg, and the battle mode is all working and all for moving, (just got the bounds equation to work), but i'm having some issues with it not detecting where the mouse is on the grid very well. Should I have it keep querying for the mouse in the loop, or another method. Haven't tried the query in the loop yet, maybe I should, but might decrease performance (what little there is atm). Sorry for the amount of code, kinda bulky and strung out. The code in question is under Battle. Appreciate the help. Thanks

Slyprid

http://forgotten-star.com/DE_Source.zip

Forgot to say before...
To get to area of code in question go to 'Continue' at title screen
Click 'Load' on Save Game 1 (other will load, but no data in them)
Then Under 'Local Hotspots' click 'Battle!' icon (player must be in city of Glaffin for this to work, but Glaffin is default point to load)

Thanks again

Slyprid