/* 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 */

// added:
var GoogleHighlightedWords = [];
var GoogleSearchWords;

function highlightWord(node,word) {
	// Iterate into this nodes childNodes
	if (node.hasChildNodes) {
		for (var 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
		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("span");

				GoogleHighlightedWords.push(hiword); // added

				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;
	var ref = document.referrer;
	if (ref.indexOf('?') == -1) return;
	var qs = ref.substr(ref.indexOf('?')+1);
	var qsa = qs.split('&');
	for (var i=0;i<qsa.length;i++) {
		var qsip = qsa[i].split('=');
	        if (qsip.length == 1) continue;
        	if (qsip[0] == 'q' || qsip[0] == 'p') { // q= for Google, p= for Yahoo
			var words = decodeURIComponent(qsip[1]).replace(/\+/g,' ').split(/\s+/); // changed
	                GoogleSearchWords = words; // added
					for (var w=0;w<words.length;w++) {
						highlightWord(document.getElementsByTagName("body")[0],words[w]);
                	}
	        }
	}
}

// changed:
if (window.addEventListener)
{
	window.addEventListener('load',googleSearchHighlight,true);
}
else if (window.attachEvent)
{
	window.attachEvent('onload',googleSearchHighlight);
}