title: Google Maps API v3: How do I dynamically change the marker icon?
body: <p>Using Google Maps API v3, how do I programmatically change the marker icon?</p>
  
  <p>What I would like to do is, when someone hovers over a link - to have the corresponding marker icon on the map change colors to denote the marker in question.</p>
  
  <p>Essentially, the same function as what Roost does.</p>
  
  <p>When you hover over a home listing on the left, the corresponding marker on the right changes color</p>