I should have asked: what version OS are you running, i.e., 10.4.10? Are you using Safari or IE or Firefox?

You don't say so explicitly, but do you also have Shockwave?

Frankly I'm not confident that any of these save the Schubert pdf plug-in would be relevant to the right hand side of the WDS page containing the diagrams.....OTOH, the mime type says "image" so maybe up-to-date Quicktime is key, and just to be sure, the latest version of Windows Media Player.....

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BMWs: 2007 X5 3.0
2002 330xi
1991 525i (ret'd)
1985 325e (ret'd)