Two enemies dominate the same victim, who controls it?

[taltamir]

If two enemies cast dominate on the same victim, which one of them ends up in control?
The description in the SRD does not account for the possibility.

[Necrosnoop110]

"If a creature is under the mental control of two or more creatures, it tends to obey each to the best of its ability, and to the extent of the control each effect allows. If the controlled creature receives conflicting orders simultaneously, the competing controllers must make opposed Charisma checks to determine which one the creature obeys." - DMG p172

[taltamir]

Thank you