Google Chrome Frame - custom install dialog with "onmissing"

Can anyone point me at an example of a customized Google Chrome Frame install dialog?

It looks like GCF allows you to hide the default dialog as a parameter to CFInstall.check() (onmissing, preventPrompt) but I haven't been able to find an example of what the expected structure of onmissing is.

I can have onmissing launch a custom dialog of my own, with jQuery or similar, but don't know exactly where to link to in order to start the install process correctly. Whenever I redirect to the installer directly, I get prompted for an admin password, unlike when I use the default GCF install dialog.

Thanks!

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