99 grand cherokee window problem

I have a 99 grand cherokee and the passenger side window just stopped working on me. If i try to roll it down from the driverside it makes a click and the lights kind of dim, but window doesnt roll down... and it does nothing when i try it on the passenger side. What do u think....possibly window motor or could it be somthing else.. and if it is the window motor how hard are they to replace.

Thanks for the help
Zach

I think you are on the right track and I think that they are simple to swap out with the door panel off.