title: multiple id selector using fliter.js
body: <p>Now i have two divs with different id (<code>#filter1</code>, <code>#filter2</code>).
  I want the selection inside div (<code>.tags</code>) can change the result of (<code>#filter1</code>, <code>#filter2</code>) at the same time.</p>
  
  <p>I have tried to use multiple id selector, but seems cannot work.</p>
  
  <pre><code>$(function(){
  $('#filter1, #filter2').filter();
  });
  </code></pre>
  
  <p>additionally, i would like to set while i selected D1, the multiple selection of D2 will be disabled
  it can just switch the option from D1 to D2 if i click D2
  (as they are in the same catagory)</p>
  
  <p><a href="http://jsfiddle.net/co2kwan/gme8z/1/" rel="nofollow">DEMO</a></p>
  
  <p>i am a beginner on js, hope can get help from you</p>
  
  <p>many thanks</p>