removing "Return to last results" control

Hello,

A couple of questions about the round control that allows the users to
pan, return to last results.

1. For the "Return to last results" part, how does it determine what
the "last results" are?

2. Is there a way I can remove the return to last results portion, but
keep the zoom control?

This code removes both the zoomlevel control and return to last
results:

// remove pan/go to last result control
ui = map.getDefaultUI();
ui.controls.largemapcontrol3d = false;
ui.controls.scalecontrol = true;
map.setUI(ui);

The page is: http://devasp.northcarolina.edu/iic/exams/find.php

Any ideas?
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