/* 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 */
function highlightWord(node,word) {
	// Iterate into this nodes childNodes
	if (node.hasChildNodes) {
		var hi_cn;
		for (hi_cn=0;hi_cn<node.childNodes.length;hi_cn++) {
			highlightWord(node.childNodes[hi_cn],word);
		}
	}
	
	// And do this node itself
	if (node.nodeType == 3) { // text node
		tempNodeVal = node.nodeValue.toLowerCase();
		tempWordVal = word.toLowerCase();
		if (tempNodeVal.indexOf(tempWordVal) != -1) {
			pn = node.parentNode;
			// check if we're inside a "nosearchhi" zone
			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!
				nv = node.nodeValue;
				ni = tempNodeVal.indexOf(tempWordVal);
				// Create a load of replacement nodes
				before = document.createTextNode(nv.substr(0,ni));
				docWordVal = nv.substr(ni,word.length);
				after = document.createTextNode(nv.substr(ni+word.length));
				hiwordtext = document.createTextNode(docWordVal);
				hiword = document.createElement("span");
				hiword.className = "searchword";
				hiword.appendChild(hiwordtext);
				pn.insertBefore(before,node);
				pn.insertBefore(hiword,node);
				pn.insertBefore(after,node);
				pn.removeChild(node);
			}
		}
	}
}


function googleSearchHighlight() {
        if (!document.createElement) return;
        ref = location.href;
        if (ref.indexOf('?') == -1) return;
        qs = ref.substr(ref.indexOf('?')+1);
        qsa = qs.split('&');
        for (i=0;i<qsa.length;i++) {
                qsip = qsa[i].split('=');
                        if (qsip.length == 1) continue;
                        if (qsip[0] == 'search_terms') {
                                if (qsip[1].length < 1) return;
                                    var words;
                                    // words = unescape(qsip[1].replace(/\+/g,' ')).replace(/\"/g, '').split(/\s+/);
                                    // quoted parts
                                    var undefined;
                                    unquoted_terms = unescape(qsip[1].replace(/\+/g,' ')).replace(/"[^"]*"/g, ' ').replace(/"/g, '').split(/\s+/);
                                    quoted_terms = unescape(qsip[1]).match(/"[^"]*"/g);
                                        // process unquoted_terms to remove actual quotes
                                        if (quoted_terms){
                                            for (x=0;x<quoted_terms.length;x++) {
                                                quoted_terms[x] = quoted_terms[x].replace(/"/g,'').replace(/\+/g,' ');
                                            }
                                            words = quoted_terms.concat(unquoted_terms);
                                        } else {
                                            words = unquoted_terms;
                                        }
                                        for (w=0;w<words.length;w++) {
                                            if (words[w] != "") {
                                                highlightWord(document.getElementsByTagName("body")[0],words[w]);
                                            }     
                                        }
                        }
        }
}


addLoadEvent(googleSearchHighlight);