"Select/deselect all users" Checkbox Not Visible

When the number of FECRU users grows to more than 30 to span more than one user page (Administration >> User Settings >> Users) the checkbox to select or deselect all users is hidden by the buttons used to navigate the multiple user pages.

Chrome 19.0.1084.52
FF 10.0.2
IE 9.0.8112.16421

View Source:
<th><input type="checkbox" id="userSelector" title="Select/deselect all users"></th>