Element.prototype.containsElement

@Description: Determines if this this element contains another. Inspired by John Resig blog
@File: Element/prototype/containsElement.js
@Author: Paul Visco
@Version: 0.1 5-21-09 06-03-09
@Param: b The other element to check if for
@Return: returns boolean If this contains b
@Example:

$('#one_element').containsElement('#another_element');