HightlightText.js

function highlightText(node, text) {
    var skip = 0;
    if (node.nodeType == 3) {
        var pos = node.data.toUpperCase().indexOf(text.toUpperCase());
        console.log(node.data);

        if (pos >= 0) {
            var spannode = document.createElement('span');
            spannode.className = 'highlight';
            spannode.style.backgroundColor = 'yellow'
            var middlebit = node.splitText(pos);
            var endbit = middlebit.splitText(text.length);
            var middleclone = middlebit.cloneNode(true);
            spannode.appendChild(middleclone);
            middlebit.parentNode.replaceChild(spannode, middlebit);
            skip = 1;
        }
    }
    else if (node.nodeType == 1 && node.childNodes && !/(script|style)/i.test(node.tagName)) {
        for (var i = 0; i < node.childNodes.length; ++i) {
            i += innerHighlight(node.childNodes[i], text);
        }
    }
    return skip;
}