title: Checkbox to filter wordpress posts by selecting multiple categories (AND not OR)
body: <p>I am working on a job site on which jobs will have categories titles like, salary, Sector, Location etc. The idea is to enable a visitor to filter out posts by selecting appropriate checkboxes for all these three categories and show the posts which contains category parameters chosen by the user. Here is an example of what i am looking for : <a href="http://underwearking.nl/heren/" rel="nofollow">http://underwearking.nl/heren/</a>   (see the left sidebar)</p>
  
  <p>I have gone through over 200 plugins and searched wordpress thoroughly but i am unable to find any plugin which fulfills this. Also, I don't know much about coding but i know that it involves something like integration of jQuery Ajax and checkboxes...
  Can someone please help me??? </p>