/* http://www.kryogenix.org/code/browser/searchhi/ */
/*http://www.tedpavlic.com/post_highlighting_search_results_with_ted_searchhi_javascript.php */
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;
        ref = ref.replace(/\/search\/web\//,'?search&q='); // Most WebCrawler searches
	if (ref.indexOf('?') == -1) return;
	qs = ref.substr(ref.indexOf('?')+1);
        qsa = qs.split('#');
        qs = qsa[0];
        qs = qs.replace(/(^|&)p=Q&ts=e&/,'&'); // Most Eurekster searches
        qs = qs.replace(/(^|&)query=/,'&q='); // Most Lycos searches
        qs = qs.replace(/(^|&)key=/,'&q='); // Most Walhello searches
        qs = qs.replace(/(^|&)keywords=/i,'&q='); // Most Overture searches
        qs = qs.replace(/(^|&)searchfor=/,'&q='); // Most Mysearch.com searches
        qs = qs.replace(/(^|&)qt=/,'&q='); // Most Acoona.com searches
        qs = qs.replace(/(^|&)s=/,'&q='); // Most Technirati GET searches
	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' || qsip[0] == 'w') { // q= for Google, p= for Yahoo, w= for Eurekster
			// Trim leading and trailing spaces after unescaping
			qsip[1] = unescape(qsip[1]).replace(/^\s+|\s+$/g, "");
			if( qsip[1] == '' ) continue;
                        phrases = qsip[1].replace(/\+/g,' ').split(/\"/);
			for(p=0;p<phrases.length;p++) {
			        phrases[p] = unescape(phrases[p]).replace(/^\s+|\s+$/g, "");
				if( phrases[p] == '' ) continue;
				if( p % 2 == 0 ) words = phrases[p].replace(/([+,()]|%(29|28)|\W+(AND|OR)\W+)/g,' ').split(/\s+/);
				else { words=Array(1); words[0] = phrases[p]; }
	                	for (w=0;w<words.length;w++) {
					if( words[w] == '' ) continue;
					highlightWord(document.getElementsByTagName("body")[0],words[w]);
					if( p % 2 == 0 ) searchhi_string = searchhi_string + ' ' + words[w];
					else searchhi_string = searchhi_string + ' "' + words[w] + '"';
                		}
			}

	        }
	}
}

window.onload = googleSearchHighlight;