title: passing custom javascript object property as parameter in function to update
body: <p>Is it possible to pass a javascript object's property to a function to update the value of the property?  Right now I have an object like...</p>
  
  <pre><code>element = { 
     border: { 
       width:0
     }
  }
  </code></pre>
  
  <p>I'm trying to pass in an instance of this object to a function to update the width property but it's not working.  Something like...</p>
  
  <pre><code>var instance = new element();
  UpdateWidth(instance.border.width, 50);
  </code></pre>
  
  <p>I'm guessing inside the function it's just getting the value of instance.border.width and not the property itself.  Is this possible to do?  Thanks.</p>