title: Random Background image through external CSS file
body: <p>I have to change background image of class randomly using external CSS file.
  Image has to pick randomly from define path.</p>
  
  <p>I know how to handle this in php, i have to implement it in external css file.</p>
  
  <p>looking for any css trick.</p>
  
  <p>here is css class properties.</p>
  
  <pre><code>.birthday
   {
     background:url(../images/Bday.jpg) no-repeat center;
     font: bold 25px "trebuchet ms", Tahoma, Verdana, Arial, Helvetica, sans-serif;
     color: #930204;
     padding: 25px 0px 0px 200px;
     height: 195px;
   }  
  </code></pre>
  
  <p>path is given as per file structure. </p>