Well the ID for a spawner is 52, but it uses Tile data (same way a chesst knows what its holding) to define the monster it spawns, and the only way to adjust that is MCedit, Risugami's spawner editor, or worldedit. Can also be spawned with NEI, but NOT TMI.
Private Mod Note
Rollback Post to RevisionRollBack
If you build a man a fire he will be warm for a day,
If you set a man on fire he will be warm for the rest of his life.