VBGamer

Hey, I'm currently writting a Map Editor w/ VB using BitBlt and was wondering how to include 'layers.' My Map Editor is about 60% complete and can add tiles and images, however, I want to be able to make use of layers for the obvious reasons, like if I add and image, and then later remove it, I want the background tiles to be there. So how would I go about doing this? Thanks!