Another way to use iterative to check if otherNode is a child element of refNode

checkParent.js

//Inspired by jQuery, link: http://www.zhangsuoyong.com/?p=111

function checkParent(refNode, otherNode) {
    var parent = otherNode.parentNode;
    try {
        while ( parent && parent !== refNode ) {
            parent = parent.parentNode; 
        }
        return (parent !== refNode);
    } catch(e) {}
}