Multiple pagers in single page
You can use the element parameter:


  An optional integer to distinguish between multiple pagers on one page.


e.g.

First call:

$output .= theme('pager', array('tags' =&gt; array(), 'element' =&gt; 0));


Second call:

$output .= theme('pager', array('tags' =&gt; array(), 'element' =&gt; 1));