Alternatively, if you're on a Unix-like system, you can download them all easily using wget:

wget -nd -A.mov -r -l1 -np http://ice.fas.harvard.edu/%7Ebok_cen/booksvid/vids/hts/

For anyone who doesn't know wget, this can be dissected to:

-nd means "no directories", so don't mirror the directory structure

-r means to visit recursively (i.e. grab relative links)

-l1 means "one level" (i.e. don't grab the links from any subpages)

-np means "no parent" (i.e. don't go to subdirectories which are parent of the current one)

-A.mov means 'accept' .mov (i.e. download movs)