You can help conceal your allies.
Whenever you are adjacent to an ally, and neither you nor that ally move for at least 1 round, and both you and that ally attempt Stealth checks, that ally can use your Stealth check result if it is better than his own.
The text on this page is Open Game Content, and is licensed for public use under the terms of the Open Game License v1.0a.
Sources:
SECTION 15