I could do you something with QuickTime. ( iMac. 10.6.2)
Afraid I don't have Camtasia though it is available for macs .
If you don't get a better offer just IM me and I'll try to help.
cheers.
Gini

" Try and be nice to people, avoid eating fat, read a good book every now and then, get some walking in, and try and live together in peace and harmony with people of all creeds and nations."
-Monty Python