var IE4   = false;
var NS4   = false;
var DOM   = false;
var DHTML = false;

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;
}

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");
  var title = cookie ? cookie : getPreferredStyleSheet();
  setActiveStyleSheet(title);
  
  if (document.getElementById) {DOM = true;}
  else { 
    if (document.layers) { NS4 = true;}
    else { IE4 = true;}
  }
  DHTML = DOM || NS4 || IE4; 
  
  if (!DHTML) { alert("Browser unterstützt kein DHTML! Webseite nur eingeschränkt zugängig!"); } 
}

function getElById(eID) {
  if (!DHTML) { return void (0);}
  
  if (DOM) { return document.getElementById(eID);}
  else if (NS4) { return document.layers[eID];}
  else if (IE4) { return document.all[eID];}
}

function getStyleElById(eID) {
  var elementObject = getElById(eID);
  if (NS4) {return elementObject;}
  else {return elementObject.style;}
  
  //alert("eID= " + eID + "  /  Object= " + elementObject.id);
}

function goTop() {
  if (BrowserDetect.browser == "Explorer" && BrowserDetect.version < "7" )
    { location.href = '#go_top'; }
  var ptXY = new Array();
  ptXY     = retDocXY();
  if (ptXY[1] != 0) { scrollTo(0, 0); }
}

function goToAnchor(anchorName, eID) {
  var ptXY = new Array();
  location.href = anchorName;
  ptXY = retDocXY();
  goToY_Minus(ptXY[1], eID);
}
  
function retDocXY() {   
  var ptY = 0;
  var ptX = 0;
  if(typeof(window.pageYOffset) == 'number') { // NS
    ptY = window.pageYOffset;
    ptX = window.pageXOffset;
  } 
  else if(document.body && (document.body.scrollLeft || document.body.scrollTop)) { //DOM
    ptY = document.body.scrollTop;
    ptX = document.body.scrollLeft;
  } 
  else if(document.documentElement && (document.documentElement.scrollLeft || document.documentElement.scrollTop)) { //IE6 standards compliant mode
    ptY = document.documentElement.scrollTop;
    ptX = document.documentElement.scrollLeft;
  }
  return [ptX, ptY];
}

function goToY_Minus(ptY, eID) {  
  var iMinus = 0;
  if (typeof(getElById(eID).offsetTop) == 'number' && getElById(eID).offsetTop > 0) 
    { iMinus = getElById(eID).offsetTop;}
  else
    { iMinus = retPosY(getElById(eID));}
  
  //alert("ptY=" + ptY + "  /  getElById(eID).offsetTop=" + iMinus);
  scrollTo(0, parseInt(ptY) - iMinus);
}

function retPosY(obj) {
	var ptY = 0;
	if (obj.offsetParent) {
	  do { ptY += obj.offsetTop;} while (obj = obj.offsetParent);}

	return ptY;
}

function openTabGoToAnchor(urlAndAnchorName, eID) {
  var win = window.open(urlAndAnchorName, "KSVF2");
}

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


var BrowserDetect = {
	init: function () {
		this.browser = this.searchString(this.dataBrowser) || "An unknown browser";
		this.version = this.searchVersion(navigator.userAgent)
			|| this.searchVersion(navigator.appVersion)
			|| "an unknown version";
		this.OS = this.searchString(this.dataOS) || "an unknown OS";
	},
	searchString: function (data) {
		for (var i=0;i<data.length;i++)	{
			var dataString = data[i].string;
			var dataProp = data[i].prop;
			this.versionSearchString = data[i].versionSearch || data[i].identity;
			if (dataString) {
				if (dataString.indexOf(data[i].subString) != -1)
					return data[i].identity;
			}
			else if (dataProp)
				return data[i].identity;
		}
	},
	searchVersion: function (dataString) {
		var index = dataString.indexOf(this.versionSearchString);
		if (index == -1) return;
		return parseFloat(dataString.substring(index+this.versionSearchString.length+1));
	},
	dataBrowser: [
		{ 	string: navigator.userAgent,
			subString: "OmniWeb",
			versionSearch: "OmniWeb/",
			identity: "OmniWeb"
		},
		{
			string: navigator.vendor,
			subString: "Apple",
			identity: "Safari"
		},
		{
			prop: window.opera,
			identity: "Opera"
		},
		{
			string: navigator.vendor,
			subString: "iCab",
			identity: "iCab"
		},
		{
			string: navigator.vendor,
			subString: "KDE",
			identity: "Konqueror"
		},
		{
			string: navigator.userAgent,
			subString: "Firefox",
			identity: "Firefox"
		},
		{
			string: navigator.vendor,
			subString: "Camino",
			identity: "Camino"
		},
		{		// for newer Netscapes (6+)
			string: navigator.userAgent,
			subString: "Netscape",
			identity: "Netscape"
		},
		{
			string: navigator.userAgent,
			subString: "MSIE",
			identity: "Explorer",
			versionSearch: "MSIE"
		},
		{
			string: navigator.userAgent,
			subString: "Gecko",
			identity: "Mozilla",
			versionSearch: "rv"
		},
		{ 		// for older Netscapes (4-)
			string: navigator.userAgent,
			subString: "Mozilla",
			identity: "Netscape",
			versionSearch: "Mozilla"
		}
	],
	dataOS : [
		{
			string: navigator.platform,
			subString: "Win",
			identity: "Windows"
		},
		{
			string: navigator.platform,
			subString: "Mac",
			identity: "Mac"
		},
		{
			string: navigator.platform,
			subString: "Linux",
			identity: "Linux"
		}
	]

};
BrowserDetect.init();


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