Element.prototype.highlight

@Description: This effect is used to briefly highlight an element, returning to the original background color afterwards.
@File: Element/prototype/highlight.js
@Author: James Lindley
@Version: 1.0
@Param: string startColor The highlight color. Defaults to light yellow.
@Param: string endColor The color the background will be at the end of the effect (defaults to existing background color)
@Param: integer duration The time milliseconds to highlight the element. Defaults to 1/3 of a second.
@Param: function onEnd Callback for after the highlight is over.
Example:
// Highlight an element via a red background, and fade back to normal over 0.5 seconds.
var highlight = $('#new_element').highlight({startColor : '#FF9999', duration : 500, onEnd : function(){
alert('done');
}});