[Edit]: this is for Wicket 1.6.. Wicket 1.5 is a bit trickier. I will look into it later.
I would recommend making a Wicket component for this; and adding Jquery javascript when the component needs to be rendered.
You can use http://ci.apache.org/projects/wicket/apidocs/6.0.x/org/apache/wicket/markup/head/OnDomReadyHeaderItem.html
@Override
public void renderHead(IHeaderResponse response) {
response.render(OnDomReadyHeaderItem.forScript(yourMethod(..., component.getMarkupId())));
}
I think Wicket 1.5 offers similar approachs