function findAndReplace(searchText, replacement, searchNode) {
    		if (!searchText || typeof replacement === 'undefined') {
        	// Throw error here if you want...
        	return;
    	}
    	var regex = typeof searchText === 'string' ?
      new RegExp(searchText, 'g') : searchText,
      	childNodes = (searchNode || document.body).childNodes,
        	cnLength = childNodes.length,
        	excludes = 'html,head,style,title,link,meta,script,object,iframe';
   	 	while (cnLength--) {
        		var currentNode = childNodes[cnLength];
        		if (currentNode.nodeType === 1 && (excludes + ',').indexOf(currentNode.nodeName.toLowerCase() + ',') === -1) {
            		arguments.callee(searchText, replacement, currentNode);
        		}
        if (currentNode.nodeType !== 3 || !regex.test(currentNode.data) ) {
            continue;
        }
        var parent = currentNode.parentNode,
            frag = (function(){
                var html = currentNode.data.replace(regex, replacement),
                    wrap = document.createElement('div'),
                    frag = document.createDocumentFragment();
                wrap.innerHTML = html;
                while (wrap.firstChild) {
                    frag.appendChild(wrap.firstChild);
                }
                return frag;
            })();
        parent.insertBefore(frag, currentNode);
        parent.removeChild(currentNode);
    }
}