title: jQuery ui google map check if marker is in view
body: <p>I am using
  <a href="http://code.google.com/p/jquery-ui-map/" rel="nofollow">http://code.google.com/p/jquery-ui-map/</a></p>
  
  <p>I am trying to find a way when looping through markers, of finding out if the markers are visible within the current viewport.</p>
  
  <p>Does anybody know how to do this. I have tried isVisible()</p>