Actually I looked it up it<span class="bbc_u">is</span>opposed Charisma checks.<br/><br/><strong>Multiple Mental Control Effects</strong><br/>Sometimes magical effects that establish mental control render each other irrelevant, such as a spell that removes the subjects ability to act. Mental controls that don’t remove the recipient’s ability to act usually do not interfere with each other. 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.<br/><br/>http://www.d20srd.org/srd/magicOverview/castingSpells.htm (http://www.d20srd.org/srd/magicOverview/castingSpells.htm)<br/>Its at the bottom of the page.