SCRIPT: Tele_SW_Org.gm (read all info below)
This GM (Game Monkey) script makes a game object with ID 19191915 teleport horde players to Orgrimmar and alliance players to Stormwind when right clicked on. You can make your own Game Object or use the one I included at the bottom, if you make your own, make sure the 'spellfocus' field's value is 0.
To use the script, just put it into your Ascent Scripts folder. If you don't have a scripts folder then just make one.
Game Object SQL: Portal OBJECT.sql
I really did make this myself so if you appreciate it, please post in the thread!