title: background-image with tr and th
body: <p>I have 'tr' with background-image and on 'th' I want to show a image on its right corner to indiect if this column is sorted. I have css style like following:</p>
  
  <p>tr.header {</p>
  
  <pre><code>background-image: url(../Images/bg.gif);
  background-repeat: repeat-x;
  </code></pre>
  
  <p>}</p>
  
  <p>th.sort {</p>
  
  <pre><code>background-repeat: no-repeat; 
  background-position: center right; 
  background-image: url(../Images/sort_bg.gif);
  </code></pre>
  
  <p>}</p>
  
  <p>This works well on IE8 and firefox3, but not on IE7.</p>
  
  <p>Anyone has any idea of how to make it working on IE7?</p>