function highlightWord(node, word, col)
{
	colc = "hl"+col;
	// 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,col);
		}
	}

	if (node.nodeType == 3)
	{
		tempNodeVal = node.nodeValue.toLowerCase();
		tempWordVal = word.toLowerCase();
		if (tempNodeVal.indexOf(tempWordVal) != -1)
		{
			pn = node.parentNode;
			if ((pn.className != colc) )
			{
				// 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 = colc;
				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
			keyword = '';
			words = unescape(qsip[1].replace(/\+/g,' ')).split(/\s+/);
			
			for (w=0;w<words.length;w++)
			{
				
				highlightWord(document.getElementById('contentblock'),words[w],w%10);
				if (keyword != '')
				{
					keyword = keyword + " ";
				}

				keyword = keyword + words[w];
			}

			//document.getElementById('keyword').value = keyword;
		}
	}
}
window.onload = googleSearchHighlight;