Having problems getting a javascript callback to work...

Below is my attempt at creating a link who's onclick method calls a
java method. I set a break point on displaySomeInfo but it never gets
called.
Does anyone know what I'm doing wrong?

Thank you,

Scott

VerticalPanel panel;

public void onModuleLoad() {
createCallback();
panel = new VerticalPanel();
panel.add(new HTML("<A href=\"#\" onclick=\"callback('ziggy
dog');return false;\">Click here.</A>"));
RootPanel.get().add(panel);
}

private void displaySomeInfo(String aStringToDisplay) {
panel.insert(new HTML(aStringToDisplay), 0);
}

private static native void createCallback()
/*-{
var that = this;
$wnd.callback = $entry(function()
{ that.@com.compoz.earth.client.Earth::displaySomeInfo(Ljava/lang/
String;); });
}-*/;

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