I want to make space on an old MacBook we have. It's still running 10.4. Using Disk Inventory I see the biggest contribution to the contents of the HD is all the movies contained in the iPhoto library. I'd like to move these to an external HD. Is there a simple way to copy the iPhoto library to the HD, retaining all the folder/sub-folder hierarchy, but only including files with extension .mov or .mp4 or .mpg? And then is there a simple way to select all these files on the HD and delete them, once I'm sure they've been copied properly?