Changing tile properties (walkable to non-walkabe)

hello, everyone!

this question applies to a game i’m working on in Flash MX. the hero is centered on an isometric, scrolling map.

first, are there any good tutorials on turn-based combat in flash? i haven’t been able to find any.

please note that i am new to actionscript, and i don’t plan on using pathfinding in this project.

i’m just trying to figure out how i can change all walkable tiles on the map to non-walkable except for two tiles in each direction around the hero (or around the enemy, depending on who’s turn it is.

does this make any sense? thanks so much in advance for any guidance.
(sorry if this is the wrong forum, i’m new and it looks like there are many more people browsing this forum than the AI programming one :slight_smile: