Try using this script.
PHP Code:
//#CLIENTSIDE
if (playerenters) {
addtiledef tiles_inside.png,g2k2castledustari1_,1;
addtiledef2 tiles_wallscastledustari.png,g2k2castledustari1_,1024,224;
addtiledef2 tiles_dustarifloor.png,g2k2castledustari1_,1216,0;
addtiledef2 tiles_dustaricarpet.png,g2k2castledustari1_,1,0;
}