Changing Map Array in TileBased Gaming

Hey people of the Kirupa forums! I’m currently working on a tile based game. I’ve used the TonyPa tutorials to help me learn how to create, and scroll tile based worlds with a character. This is my second bump in the road(the first one I figured out on my own, and I felt pretty stupid about it…), I’m trying to make it so if the MovieClip game.clip.kid hits anyone of the Tile1, that same Tile1 will change into Tile5.(Of Course, changing the map array itself so if a player scrolls out, the tile won’t be changed back to normal) (sorry if this seems confusing). Any help will be appericated. Thanks!