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Find The Previous Sibling Of A Element Given A Search Tag Name

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        Find the previous sibling of a element given a search tag name

//+ Jonas Raoni Soares Silva
function findPrevious(o, tag, limit){
	for(tag = tag.toLowerCase(); o = o.previousSibling;)
		if(o.tagName && o.tagName.toLowerCase() == tag)
			return o;
		else if(limit && o == limit)
			return null;
	return null;