You can do this by copying view-view.tpl.php from the views / theme directory to your theme. Once he's there, edit it and copy the lines
<?php if ($pager): ?>
<?php print $pager; ?>
<?php endif; ?>
below the section views-contentand place another copy above.
Please note that this will duplicate the pager for all your views. If you only need to do this on a very specific view, you can click on the topic information section of the view editing form and it will show you all the possible templates for a particular view.
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