Google Chrome Frame - How can you detect when GCF fails to install (general failure, or blocked)

Question

Is there any way you can detect if the installation of Google Chrome Frame fails, or was blocked? I am using the CFInstall script. Here's my implementation:

CFInstall.check(
{
    preventPrompt: true,
    destination: window.location.toString(),

    onmissing: function ()
    {
        /* User clicks a button, iframe is shown... */
    }
});

...

<iframe src="https://www.google.com/chromeframe/eula.html?user=true"
        id="googlechromeframe"
        name="googlechromeframe"></iframe>

Note that I am pointing users to the user-specific installer, which doesn't require admin-privileges. The installation can still be blocked though...