title: jQuery insert text into a string after last /
body: <p>I have a URL:</p>
  
  <p><a href="http://test.com/backgrounds/testimage.jpg" rel="nofollow">http://test.com/backgrounds/testimage.jpg</a></p>
  
  <p>and I need to insert a 't_' at the beginning of the filename resulting in:</p>
  
  <p><a href="http://test.com/backgrounds/t_testimage.jpg" rel="nofollow">http://test.com/backgrounds/t_testimage.jpg</a></p>
  
  <p>What would be the simplest way to do this in jQuery? Thanks for any help :)</p>