Squeak

i have a squeaky sound from under neath the car, when i was under the car while it was running it sounded like it was coming from the front passenger side of the transmission ( manual) the sound is effected by rpm's( higher rpm= faster squeak ) i noticed that at the connection of the transmission to my drive shaft there is fluid leaking but it doesn't look like much. I am thinking the sound might be from low fluid in the tranny but there isn't really a way to check that i know of.

Any ideas? should i try adding some fluid.

Car has about 45,000 on it. (2004)

no it is not the TOB, it doesn't go away when clutch is in. It is not a very loud sound, it is actually hard to hear over the exhuast but when i was under i could hear it well.