Style Switch problem with background image

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1) Style Switch

2) Shttp://www.dynamicdrive.com/dynamicindex9/stylesheetswitcher.htm

3) Describe problem:
The style switch has been working great up until today. Today I wanted to change an image depending on which style is selected. but when I switch styles it doesn't load the other image.

I'm using the FAUX background, and in my alternate style sheet, I have replaced the image source to the new image.

When I switch styles, it just removes the original image with nothing.

This should work right?

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anyone have any ideas?

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Why would this background image not change?

Everything else works fine, but just not this. I've checked the image path, everything is fine.

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Anyone Here?