tilelayer - The url to the base directory of the tiles. Don't add a / at the end.
tileminzoom - The minimum zoom of the tiles
tilemaxzoom - The maximum zoom of the tiles
tileopacity - The opacity of the custom tiles (1 is not transparent, 0 is invisible, 0.5 midway)
tilebounds - The bounds of a the custom tiles consists of coordinates for leftbottom (southwest) and right top (northeast). All values should be seperated by comma
tilemethod - The method to get the tiles. This can be maptiler for a special function. Or the complete url and define the x, y and z as parameters in the url like: http://www.yourdomain.com?z=[Z]&x=[X]&y=[Y]. See: Tilecoordinates