title: submit button with background image in internet explorer 8
body: <p>On <a href="http://summer-festivals.cloudfoundry.com/" rel="nofollow noreferrer">this site</a>, I have a search form whose submit button has a background image</p>
  
  <p><img src="https://i.stack.imgur.com/TErL9.jpg" alt="enter image description here"></p>
  
  <p>But when I view the site in IE8, the image doesn't appear. </p>
  
  <p><img src="https://i.stack.imgur.com/q0hRx.jpg" alt="enter image description here"></p>
  
  <p>Is there anything I can do to persuade IE8 to show the image (that doesn't cause it to disappear in other broswers)?</p>