Funky passenger window behavior.

[supersparker]

Tried to roll the passenger window down this afternoon, and was met with a strange "binding" sound and then it stopped about 1/3 of the way down. When I shut the door with the window rolled up, it once again, makes that "binding" sort of a sound and then rolls 1/3 of the way down and stops. The car is an '01 Boxster.

Window regulator?


Thanks in advance for any help..