You don't really need any extra program to create tilesets, since its a 304x160 bmp. Once you have created a tileset, you can easily use it on your map by importing it with SSME. More information on http://www.shanky.com/server/howto-zone/tiles/index.html P.S. You should use the tileset template from there, edit in paint (if you haven't got photoshop), save as .bmp (8-bits) and then import it.