/* http://www.kryogenix.org/code/browser/searchhi/ */
/* Modified 20021006 to fix query string parsing and add case insensitivity */
/* Modified 20070316 to stop highlighting inside nosearchhi nodes */
/* Modified 20071201 to use the script as document-search by Michael Loesler - http://derletztekick.com */

function DocSearch() {

    this.highlightWord = function (node, word) {
        // Iterate into this nodes childNodes
        if (node.hasChildNodes) {
            var hi_cn;
            for (hi_cn = 0; hi_cn < node.childNodes.length; hi_cn++) {
                this.highlightWord(node.childNodes[hi_cn], word);
            }
        }

        // And do this node itself
        if (node.nodeType == 3) { // text node
            var tempNodeVal = node.nodeValue.toLowerCase();
            var tempWordVal = word.toLowerCase();
            if (tempNodeVal.indexOf(tempWordVal) != -1) {
                var pn = node.parentNode;
                // check if we're inside a "nosearchhi" zone
                var checkn = pn;
                while (checkn.nodeType != 9 &&
                    checkn.nodeName.toLowerCase() != 'body') {
                    // 9 = top of doc
                    if (checkn.className.match(/\bnosearchhi\b/)) { return; }
                    checkn = checkn.parentNode;
                }
                if (pn.className != "searchword") {
                    // word has not already been highlighted!
                    var nv = node.nodeValue;
                    var ni = tempNodeVal.indexOf(tempWordVal);
                    // Create a load of replacement nodes
                    var before = document.createTextNode(nv.substr(0, ni));
                    var docWordVal = nv.substr(ni, word.length);
                    var after = document.createTextNode(nv.substr(ni + word.length));
                    var hiwordtext = document.createTextNode(docWordVal);
                    var hiword = document.createElement("strong");
                    hiword.className = "searchword";
                    hiword.appendChild(hiwordtext);
                    pn.insertBefore(before, node);
                    pn.insertBefore(hiword, node);
                    pn.insertBefore(after, node);
                    pn.removeChild(node);
                }
            }
        }
    };
}

window.onload = function () {
    var q = window.location.search.substring(1).split('&');
    if (!q.length)
        return false;
    var docSearch = new DocSearch();
    var bodyEl = document.body;
    for (var i = 0; i < q.length; i++) {
        var vars = q[i].split('=');
        new DocSearch().highlightWord(bodyEl, unescape(vars[1]));
    }
    return true;
};