/* 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 = document.referrer;
	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] == 'q' || qsip[0] == 'p')
		{
			// q= for Google, p= for Yahoo
			words = unescape(qsip[1].replace(/\+/g, ' ')).split(/\s+/);
			for (w = 0; w < words.length; w++)
			{
				highlightWord(document.getElementsByTagName("body")[0], words[w]);
			}
		}
	}
}

window.onload = googleSearchHighlight;