var highlightcolor = "#FFFFFF";
var normalcolor    = "#E6E6E6";
var ns6            = document.getElementById&&!document.all;
var previous       = '';
var eventobj

//Regular expression to highlight only form elements
var intended=/INPUT|TEXTAREA|SELECT|OPTION/;

//Function to check whether element clicked is form element
function checkel(which){
  if (which.style&&intended.test(which.tagName)){
    if (ns6&&eventobj.nodeType==3)	eventobj=eventobj.parentNode.parentNode
    return true
  } else	return false
}  // end function

//Function to highlight form element
function highlight(e){
  eventobj=ns6? e.target : event.srcElement
  if (previous!=''){
    if (checkel(previous))
      previous.style.backgroundColor=normalcolor
      previous=eventobj
    if (checkel(eventobj))
      eventobj.style.backgroundColor=highlightcolor
  } else {
    if (checkel(eventobj))  eventobj.style.backgroundColor=highlightcolor
    previous=eventobj
  }
}

/* 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 != "highlight") {
				// 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"); // modified from span to em and back ;)
				hiword.className = "highlight";
				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] == '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]);
        }
			}
	  }
	}
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
// - - - - - - ( event listener ) - - - - - - - -
// by Scott Andrew - http://scottandrew.com
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
function addEvent(obj, evType, fn) {
	if (obj.addEventListener) {
		obj.addEventListener(evType, fn, false); 
		return true;
	}	else if (obj.attachEvent) {
		var r = obj.attachEvent('on'+evType, fn);
		return r;
	}	else {
		return false;
	}
}

// event listeners eventually to replace the one above
function addEventToObject(obj, evt, func)	{
	var oldhandler = obj[evt];
	if (typeof obj[evt] != 'function') {
		obj[evt] = func;
	}	else {
	  obj[evt] = function() {
      oldhandler();
      func();
		}
	}
}

// run all the onload scripts
function runScripts() {
	runLSPrep();
  googleSearchHighlight();
}
window.onload = runScripts;