<?php 
/*
* Implementation of hook_uninstall().
*/
function scratchpads_show_taxa_revisions_uninstall() {

  foreach (taxonomy_get_vocabularies() as $vid => $vocabulary) {
    variable_del("show_revision_w_vocabulary[{$vid}]");
    variable_del("show_revision_w_vocabulary_long[{$vid}]");
  }
  
}