title: Pass variable from module to theme template when using drupal_render
body: <p>So I need to AJAX-reload part of a page, and so I'm building a little module to just return drupal_render($node->content['the_field']). Which seems to work fine, it's returning the same output as what was originally on the page.</p>
  
  <p>The problem is that I need to send a parameter from the module to the theme layer to change some imagecache preset names depending on some states on the page.</p>
  
  <p>What would be the best way to move data from the URL of my AJAX request through the module into the field's theme template?</p>