/* http://www.kryogenix.org/code/browser/searchhi/ */
/* Modified 20021006 to fix query string parsing and add case insensitivity */
/* Modified  by webdesign.weisshart.de:
   20050530: added for site search - where target-file is called with ?q=searchword 
             unescape -> decodeURI, to cope with german Umlauts
   20050611: remove all blanks and '+' before and after searchterm (bugfix: crashes FF & Op) */
/* Installationsanleitung: http://webdesign.weisshart.de/kryogenix.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("em"); // modified from span to em
				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;

        if (document.referrer.search(/google.+/) != -1 || document.referrer.search(/yahoo.+/) != -1 || document.referrer.search(/search\.msn.+/) != -1 ) { // für Google und Co.
	//if (document.referrer.search(/google.+/) != -1) {
		ref = decodeURI(document.referrer);
	} else { // für seiteninterne Suche
		ref = unescape(document.referrer);
	}

	// added for site search - where target-file is called with ?q=searchword
	if (window.location.search) ref = unescape(window.location.search);

	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' || qsip[0] == 's') { // q= for Google, p= for Yahoo, s= for wordpress

			// words not to be highlighted:
			qsip[1] = qsip[1].replace(/\"|\'|\*|;|\bfür\s*\b|\bde.\s*\b|\bdie\s*\b|\bdas\s*\b|\bauf\s*\b|\beine+.\s*\b|\bein\s*\b|\bund\s*\b|\b(i|a).\s*\b|\bwie\s*\b|\bkann\s*\b|\bich\s*\b|\bman\s*\b|\bmit\s*\b/gi,'');
			
			// remove all blanks and '+' before and after searchterm (bugfix: crashes FF & Op)
			qsip[1] = qsip[1].replace(/^(\s+|\++)/,'').replace(/(\++)$/,'').replace(/(\s+)$/,'');
			
			
			if (qsip[1] != '') {
			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;