<pclass="arguement"><strong>duration</strong>A string or number determining how long the animation will run.</p>
<pclass="arguement"><strong>callback</strong>A function to call once the animation is complete.</p>
</li></ul>
<divclass="longdesc">
<p>The <code>.fadeOut()</code> method animates the opacity of the matched elements. Once the opacity reaches 0, the <code>display</code> style property is set to <code>none</code>, so the element no longer affects the layout of the page.</p>
<p>Durations are given in milliseconds; higher values indicate slower animations, not faster ones. The strings <code>'fast'</code> and <code>'slow'</code> can be supplied to indicate durations of <code>200</code> and <code>600</code> milliseconds, respectively. If any other string is supplied, or if the <code>duration</code> parameter is omitted, the default duration of <code>400</code> milliseconds is used.</p>
<p>If supplied, the callback is fired once the animation is complete. This can be useful for stringing different animations together in sequence. The callback is not sent any arguments, but <code>this</code> is set to the DOM element being animated. If multiple elements are animated, it is important to note that the callback is executed once per matched element, not once for the animation as a whole.</p>
<p>We can animate any element, such as a simple image:</p>
