title: Background image sometimes disappears when loading a png image over it
body: <p>This is the website: <a href="http://www.bilocali.it/vendita/lazio/" rel="nofollow">http://www.bilocali.it/vendita/lazio/</a></p>
  
  <p>The problem is regarding the Map on the left side with google chrome only. 
  Till June everything was working properly.</p>
  
  <p>The map has a background image that sometimes disappear when I rollover and load a png over it with a simple function like this:</p>
  
  <pre><code>function rollover_region() {$('#region_div').attr('src',"/images/region/image.png");}
  </code></pre>
  
  <p>Sometimes when I do a refresh  it works. I really can't understand.
  On all other browser everything is fine. Any suggestion?</p>
  
  <p>Thanks in advance</p>