[Greasemonkey] Calling a function in GM from injected HTML

[IndaUK]

NB: I am only an average JS coder.

I have managed to inject this piece of HTML into a webpage:

<a href="javascript:RemoveGroup('Foo')">[-]</a>

My GM code looks like this:

function RemoveGroup(sGroupName)
{
    alert(sGroupName)
}

Why do I get a "RemoveGroup is not defined" error when I click the link?

Is this something to do with "unsafewindow"?

My Googling has born no fruit. Any help would be appreciated.
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