How to extend jQuery UI effect
<p>I have this effect  <code>$("#stage").effect("pulsate", { times: 1 }, 700);</code></p>

<p>But there are no configuration settings that I can use.
For example the Pulsate effect will bring the opacity down to 0% and then back up to 100%.
What can be done so that the opacity will go down to 70% instead of 0%?</p>
