Hide From Undead

Abjuration
Level: Clr 1
Components: V, S, DF
Casting Time: 1 standard action
Range: Touch
Targets: One touched creature/level
Duration: 10 min./level (D)
Saving Throw: Will negates (harmless);
see text
Spell Resistance: Yes

Undead cannot see, hear, or smell the warded creatures.
Even extraordinary or supernatural sensory capabilities,
such as blindsense, blindsight, scent, and tremorsense,
cannot detect or locate warded creatures. Nonintelligent
undead creatures are automatically affected and act as
though the warded creatures are not there. An intelligent
undead creature gets a single Will saving throw. If it fails, the
subject can’t see any of the warded creatures. However, if it
has reason to believe unseen opponents are present, it can
attempt to find or strike them. If a warded creature attempts
to turn or command undead, touches an undead creature, or
attacks any creature (even with a spell), the spell ends for all
recipients.