Problems adding Background Image when creating theme for Chrome

I am presently following this guide: http://code.google.com/p/chromium/wiki/ThemeCreationGuide to create a theme for Google Chrome.

Everything seems to work fine, the only problem i have is applying a background image to the browser. The "theme_ntp_ba开发者_Python百科ckground" that supposed to point and load the background-image seems not to be working :(

Any ideas on what may be wrong? it is definitely not the file path, i ensured this was correct.

Thanks!

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Chrome can only load png images in themes, so make sure that the image you're trying to use is a png file.

It would also help if you posted the code found in the manifest file for this theme.