U.Helper

onclick="document.getElementById('searchForm').action='http://tufti.net/load/';document.getElementById('var_x3').value='2';"

onclick="document.getElementById('searchForm').action='http://tufti.net/dir/';document.getElementById('var_x3').value='2';"

onclick="document.getElementById('searchForm').action='http://tufti.net/news/';document.getElementById('var_x3').value='14';"

<script>   
  function thismod(mod) {   
  document.poisk.action='/'+mod+'/';   
  switch (mod) {   
  case 'blog':   
  aa=13;   
  break;   
  case 'news':   
  aa=14;   
  break;   
  default:   
  aa=2;   
  }   
  document.poisk.a.value=aa;   
  }   
  </script>   
  <form name="poisk" method="post" style="margin:0px" action="/news/">   
  <input type="text" name="query" maxlength="30" size="20" /><br>  
  <select size="1" name="modul" onChange="thismod(this.value)">   
  <option value="news" selected>Новости</option>  
  <option value="load">Файлы</option>  
  <option value="publ">...</option>  
  </select><br>   
  <input type="submit" value="Поиск" />   
  <input type="hidden" name="a" value="14" />   
  </form>