var rH = {
  addEvent: function(elm, evType, fn, useCapture) {
    // addEvent cross-browser event handling for IE5+, NS6 and Mozilla
    // By Scott Andrew
    if (elm.addEventListener) {
      elm.addEventListener(evType, fn, useCapture); 
      return true;
    } else if (elm.attachEvent) {
      var r = elm.attachEvent('on' + evType, fn);
      return r;
    } else {
      elm['on' + evType] = fn;
    }
  },

  init: function() {
  
	rH.bienenfang();
	
	if(ie56) 
		document.getElementById("baum-mid").style.height = (document.getElementsByTagName("BODY")[0].offsetHeight-125) + 'px';
		

	if(rH.emailLinks!=0) {
		var cont = document.getElementById("content");
		if(cont) {
			var as = cont.getElementsByTagName("A");
			var i = as.length; 
			var activea, emq, emqp, emqp2;
			do {
				activea = as[--i];
				if(activea.className == 'emaillink') {

					emq = activea.href;
					emqp=-1;
					if(emq) { 
						emqp = emq.indexOf('(at)'); 
						if(emqp > -1) { 
							emqp2 = emq.lastIndexOf('/');
							emq = emq.substring(++emqp2,emq.length);
							emqp -= emqp2;
							} 
						}
// kein gültiger href => Text wird herangezogen und als href u. text verwendet
					if(emqp==-1) { emq = activea.firstChild.nodeValue; emqp = emq.indexOf('(at)'); }

					if (emqp > -1) {
						newemq = emq.substring(0,emqp) + '@' + emq.substring(emqp+4,emq.length);
						if(!activea.href) activea.firstChild.nodeValue = newemq;
						activea.href ='mailto:' + newemq;
						}
					}
				}
			while (i);
			}
		}
		

  },

	bienenfang: function() {
		if(document.getElementById('editfunctions')) return; /* im Editiermodus braucht man keine Bienenfängerin*/
		var cc = document.getElementById('toc-active-item');
		rH.bfangEl = document.getElementById('baum-bienenfang');
		
		if(cc) if (rH.bfangEl) {
			var h = rH.getElHeight(cc)-15
			rH.bfangpos1 = h;
			rH.bfangpos2 = -100;

			if(ie56) rH.bfangpos2 = h;
			rH.bfangloop();

			}

	},


	bfangloop: function () {
		
		rH.bfangpos2 += parseInt((rH.bfangpos1 - rH.bfangpos2)/5 + 1);
		if(rH.bfangpos1 < rH.bfangpos2 ) rH.bfangpos2 = rH.bfangpos1; 
		rH.bfangEl.style.top = rH.bfangpos2 + 'px';
		window.setTimeout(rH.bfangloop,10);
		},


	bfangEl: 0 ,
	bfangpos1: 0,
	bfangpos2: 0,
	
	getElHeight: function(element)
	{
	  var elem=element,tagname="",y=0;
	  
	/* solange elem ein Objekt ist und die Eigenschaft offsetTop enthaelt
	   wird diese Schleife fuer das Element und all seine Offset-Eltern ausgefuehrt */
	  while (elem)

	  {
	    y+=elem.offsetTop;     /* Offset des jeweiligen Elements addieren */
	    tagname=elem.tagName.toUpperCase(); /* tag-Name ermitteln, Grossbuchstaben */
	
	/* wenn beim Body-tag angekommen elem fuer Abbruch auf 0 setzen */
	    if (tagname=="BODY")
	      elem=0;
	
	/* wenn elem ein Objekt ist und offsetParent enthaelt
	   Offset-Elternelement ermitteln */
	    if (typeof(elem)=="object")
	      if (typeof(elem.offsetParent)=="object")
	        elem=elem.offsetParent;
	  }
	
	  return y;
	},


	initExtlinks: function() {
		var cc = document.getElementById('column-content');
		
		var tagtypes=["a","area"]; 
		
		var lh = 'http://' + location.hostname + '/';
		var lhz = lh.length;
		
		
		for (var j=0; j<tagtypes.length; j++) {
			var objtags = cc.getElementsByTagName(tagtypes[j]);
		    for (var i = 0; i < objtags.length; i++) {
			    // install event listeners
			    if(objtags[i].href.substring(0,lhz)!=lh) {	// Überprüfung auf externen Link
		    		rH.addEvent(objtags[i], 'click', rH.externallink, false);
		    		}
				}
			}

	},

	externallink: function(e) {
		var a = e.srcElement;
		var t = a.tagName;
		while(a.tagName!="A" && a.tagName!="BODY") a = a.parentNode;

		var w = window.open('../service/v.asp?link=' + encodeURIComponent(a.href),'neulink',''); 
		w.focus(); 
		return false; 
		},


  emailLinks: 0
};

rH.addEvent(window, 'load', rH.init, false);
var ie56;








function setActiveStyleSheet(title) {
  var i, a, main;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
      a.disabled = true;
      if(a.getAttribute("title") == title) a.disabled = false;
    }
  }
}

function getActiveStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && !a.disabled) return a.getAttribute("title");
  }
  return null;
}


// Persistenz

function getPreferredStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1
       && a.getAttribute("rel").indexOf("alt") == -1
       && a.getAttribute("title")
       ) return a.getAttribute("title");
  }
  return null;
}

function createCookie(name,value,days) {
  if (days) {
    var date = new Date();
    date.setTime(date.getTime()+(days*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();
  }
  else expires = "";
  document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
  var nameEQ = name + "=";
  var ca = document.cookie.split(';');
  for(var i=0;i < ca.length;i++) {
    var c = ca[i];
    while (c.charAt(0)==' ') c = c.substring(1,c.length);
    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
  }
  return null;
}



window.onload = function(e) {
  var cookie = readCookie("style");
//  init_kopf();
  var title = cookie ? cookie : getPreferredStyleSheet();
  setActiveStyleSheet(title);
}

window.onunload = function(e) {
  var title = getActiveStyleSheet();
  createCookie("style", title, 365);
}

var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();

setActiveStyleSheet(title);