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Find Ancestor Element Of A Tag Given An Object Reference

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        Retrieves the ancestor element of a tag given an object reference.

//+ Jonas Raoni Soares Silva
function findAncestor(o, tag){
	for(tag = tag.toLowerCase(); o = o.parentNode;)
		if(o.tagName && o.tagName.toLowerCase() == tag)
			return o;
	return null;