title: Using CSS to show a background image and it's not working
body: <p>I'm trying to use a image as a link and use CSS to show that image, however it's not working and not showing the image at all.</p>
  
  <p>HTML</p>
  
  <pre><code>&lt;a id="nav_a_img" href="#"&gt;&lt;/a&gt;
  </code></pre>
  
  <p>CSS</p>
  
  <pre><code>#nav_a_img{
   background: url("image/nav/home.png") no-repeat;
   width: 32px;
   height: 32px;
  
  }
  
  #nav_a_img:hover{
   background: url("image/nav/home_w.png") no-repeat;
   width: 32px;
   height: 32px;
  }
  </code></pre>