/********************************************************
		Copyright 2005 by Creanetsoft Sebastian Koch
		http://creanetsoft.de
		JavaScript by Sebastian Koch (skoch@creanetsoft.de)
	********************************************************/

	/* http://www.kryogenix.org/code/browser/searchhi/ */
	/* Modified 20021006 to fix query string parsing and add case insensitivity */
	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;
				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;