Ok so here's the issue (and I cannot believe anyone from the site has not tried to help you).
It is an adobe flash issue, try a different browser (I've gotten it to work in Firefox and Safari).
You will know it's working when your cursor changes to a crosshair in a circle when you hover over the image and at the bottom righ there is a pop up red arrow with more tools.
Good luck.
Plains Indian Ledger Art Project
Department of Ethnic Studies, UCSD
Ross Frank, Associate Professor
9500 Gilman, Dept. 0522
La Jolla, CA 92093-0522