How to make a movie clip collide with mouse???

Ok here is what i have done.

I made a movie clip...made it act as mouse...

I have a VCAM...the vcam follows the movie clip...but it goes out of screen...

i want to make a barrier around the image i am viewing by VCAM...the image is big...u get the idea

Or if u can...can anyone tell me how to do something like this without VCAM...just the camera following the mouse...Please help... I need it ASAP