ttr_({
  _selector_str_ : '.xhi-_svg_ellipse_',
  _attr_key_ : 'rx',
  _attr_val_ : x_radius_px
});</pre><br/>

      <p>If you have just a few style changes, <code>_setStyleAttr_</code>
      can be more efficient or easier to implement. Other times, double-buffer
      stylesheet flipping will be much faster or easier.  The easiest solution 
      is usually the best; however, if performance is critical you should
      profile both approaches in you applicaiton to help you determine which
      makes the