[onemc]

Here's a little extra error checking (shouldn't matter but better safe then sorry).

if(!empty($_REQUEST['tag'])){
  if(!empty($_REQUEST['search'])){
    $mysearch = $_REQUEST['search'];
    $from_where = "FROM links, tags WHERE tag_words='$mysearch' AND link_id=tag_link_id ORDER BY `link_votes` DESC ";
  }
}