my header images aren't rotating...

i recently created a blog, and chose atahualpa. i hate looking at code, so it seemed to be the best choice. i'm really quite a noob. what am i doing wrong? i've tried setting the options for header image java scrip rotation at 1,2, and 3 seconds, but still no rotation, in either firefox or IE. i only get occasional one-time rotation when refreshing or reloading the page.

thanks for any help you can give

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