first if that is a washer in there it need to be removed. then see those threads inside the crank arm? you need a crank removal tool that threads into them and then has a part that screws into it and pushes against the spindle to pry it off.
http://www.parktool.com/products/det...&item=CCP%2D44#
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk