HTML fixed element with scrollToFixed

Question

I’m using the scrollToFixed plugin to work with fixed elements on the screen. What I’m trying to do is, I have a div, and when my header hits a certain point, I want that div to move along and when I get near my footer, it stops. The point is that I’m not able to do this with this plugin. What I’m doing:

 $(document).ready(function () {
            $('#divBusca').scrollToFixed({
                marginTop: 20,
                limit: 1725
            });
        });

Example of what I need to do: Example here