ght="46" alt="rose" /></a>
  <img style="margin-top:13px; margin-bottom:13px;" src="../images/right.gif" width="20" height="20" alt="==>" />
  <a href="../images/rose-sigmoidal.png"><img src="../images/rose-sigmoidal.png" width="70" height="46" alt="rose-sigmoidal" /></a>
</ul>

<p>The expression can include variable assignments.  Assignments, in most cases, reduce the complexity of an expression and permit some operations that might not be possible any other way.  For example, lets create a radial gradient