//browser identifizieren
var ie = (navigator.userAgent.indexOf('MSIE')!=-1);
var macos = (navigator.platform.indexOf('Mac')!=-1);

var dom = (document.getElementById) ? 1 : 0; 
var ie4x = (document.all && !document.getElementById ) ? 1 : 0; 
var ns4x = (document.layers) ? 1 : 0; 
var ns70 = (navigator.userAgent.indexOf('Netscape/7.0')!=-1);
var other = (!dom && !ie4x && !ns4x ) ? 1 : 0; 
var opera = (navigator.userAgent.indexOf('Opera')!=-1);


//blaettervariablen
var currseite = 1;
var maxseiten = 4;

//schwarzes logo vorladen
var logoschwarz = new Image();
logoschwarz.src = 'siteimgs/logo.gif';


//bgimgs vorladen
var bgimgarray = new Array();

bgimgarray[1] = new Image();
bgimgarray[1].src = 'siteimgs/bg1.jpg';

bgimgarray[2] = new Image();
bgimgarray[2].src = 'siteimgs/bg2.jpg';

bgimgarray[3] = new Image();
bgimgarray[3].src = 'siteimgs/bg3.jpg';

bgimgarray[4] = new Image();
bgimgarray[4].src = 'siteimgs/bg4.jpg';


//bg text 4
var bgrand = new Image();
bgrand.src = 'siteimgs/bg-rand.jpg';


//schwarze pfeile vorladen
var upschwarz = new Image();
upschwarz.src = 'siteimgs/up-b.gif';

var downschwarz = new Image();
downschwarz.src = 'siteimgs/down-b.gif';

var rechtsschwarz = new Image();
rechtsschwarz.src = 'siteimgs/pfeil-r-schwarz.gif';



//scroll-variablen
var scrollpos = 0;
var scrollminY = 0;
var scrollmaxY = 0;//wird spaeter ausgerechnet
var scrollflag = 0;
var scrollspeed = 25;
var normscrolloffset = 18;//tempo pfeile
var scrolloffset = 18;
var scrollwheeloffset = 48;//tempo wheel
var oldscrolloffset = 4;
var oldscrollwheeloffset = 4;
var scrolltext = '';
var scrolltarget = 0;
var lineheight = 18;

var ganzzahl = 0;
var rest = 0;



//vars fuer pfeile ein-/aus
var contentheight = 0;
var bottomheight = 0;
var margintop = 0;// abstand scrolltext von oben
var scrollonoff = 0;//off


function sayHello(msg) {
	msgTXT = msg;
	alert(msgTXT);
}


function checkBrowser() {
	if (ie && macos) {
		top.location.href="browser/browsertrouble.html";
	}
	if (ie4 || ns4x || ns70) {
		top.location.href="browser/browsertrouble.html";
	}

}


//box um link entfernen
function nobox(){ 
	if (opera || other){return false;}
	if (ie4x){window.focus();} 
	if (dom){document.getElementById("fixbox").focus();} 
} 

function checkBrowser() {
	if (ie && macos) {
		top.location.href="browser/browsertrouble.html";
	} 
	if (ie4x || ns4x || ns70) {
		top.location.href="browser/browsertrouble.html";
	}
}

var myLayer;
var out = 'schreiben';

function findLayer(n, d) { //v4.01
	var p,i,x;
	if(!d) d=document; 
	if((p=n.indexOf("?"))>0&&parent.frames.length) {
		d=parent.frames[n.substring(p+1)].document;
		n=n.substring(0,p);
	}
	if(!(x=d[n])&&d.all) x=d.all[n];
	for (i=0;!x&&i<d.forms.length;i++) {
		x=d.forms[i][n];
	}
	for(i=0;!x&&d.layers&&i<d.layers.length;i++) {
		x=MM_findObj(n,d.layers[i].document);
	}
	if(!x && d.getElementById) x=d.getElementById(n);
	return x;
}




//rest einer ganzzahl-division zurueckgeben
function modulo(zahl,div) {
	ganzzahl = Math.floor(zahl/div);
	rest = zahl - (ganzzahl*div);
	return rest;
}

//scroll-layer finden, startposition ermitteln (on load)
function initScroll() {
	if (ns4x) {
		scrolltext = eval(document.scrolltext);
	} else {
		if (dom) {
			scrolltext = eval("document.getElementById('scrolltext').style");
		} else {
			scrolltext = eval(document.all.scrolltext.style);
		}
	}
	scrollminY = parseInt(scrolltext.top);
}

//scrollen
function scrollnow(dir) {
	scrollpos = parseInt(scrolltext.top) + (scrolloffset * dir);
	if (scrollflag == 1 && scrollpos <= scrollminY) {
		if (scrollpos > scrollmaxY) {
			scrolltext.top = scrollpos;
			window.setTimeout('scrollnow('+dir+')',scrollspeed);
		} else {
			stopscroll(dir);
		}
	}
}

//scroll starten (on mouse down)
function startscroll(dir) {
	//ggf. tempo resetten
	if (scrolloffset < normscrolloffset) {
		scrolloffset = normscrolloffset;
	}

	//hoehe inhalt holen und max. scrollpos. ermitteln
	if (dir==-1) {
		checkscroll();
		scrollmaxY = fensterhoehe() - contentheight - lineheight;
		//alert(scrollmaxY);
	} else {
		scrollmaxY = -100000;//unendlich beim hochscrollen
	}
	
	//vorzeitigen stop bei erhoehten tempo (scrollwheel) verhindern
	scrollpos = parseInt(scrolltext.top) + (scrolloffset * dir);
	if (scrollpos > scrollminY) {
		scrolloffset = oldscrolloffset;
	}
	if (scrollpos < (scrollmaxY+scrolloffset)) {
		scrolloffset = oldscrolloffset;
	}

	//jetzt scrollen
	scrollflag = 1;
	scrollnow(dir);
}

//scroll stoppen (on mouse up)
function stopscroll(dir) {
	nobox();
	scrollflag = 0;
	
	//weiterscrollen bis zum zeilenraster
	scrollpos = parseInt(scrolltext.top);
	scrolltarget = modulo(scrollpos-scrollminY, lineheight);
	if (scrolltarget != 0) {
		scrolltext.top = scrollpos + dir;
		window.setTimeout('stopscroll('+dir+')',scrollspeed);
	} else {
		scrollmaxY = scrollpos;//nach bremsen maxY neu setzen
	}
}





function fensterhoehe() {
	if (window.innerHeight) {
		return window.innerHeight;
	} else if (document.body && document.body.offsetHeight) {
		//ie
		return document.body.offsetHeight-5;//ie-bug
	} else {
		return 0;
	}
}

function checkscroll() {

	if (ie4x) {
		contentheight = parseInt(document.all.scrolltext.scrollHeight);
	} else {
		contentheight = parseInt(document.getElementById("scrolltext").offsetHeight);
	}

	//ggf. pfeile ein-/ausblenden (aus)
	if (contentheight > (fensterhoehe() - margintop)) {//ein
		scrollonoff = 1;
		if (ie4x) {
			document.all.scrollpfeile.style.display="block";
		} else {
			document.getElementById("scrollpfeile").style.display="block";
		}
	} else {//aus
		scrollonoff = 0;
		if (ie4x) {
			document.all.scrollpfeile.style.display="none";
		} else {
			document.getElementById("scrollpfeile").style.display="none";
		}
		scrolltext.top = scrollminY;
	}
}



//verschiedene browser = verschiedene event-arten

function hookEvent(element, eventName, callback) {
	if(typeof(element) == "string") {
		element = document.getElementById(element);
	}
	if(element == null) {
		return;
	}
	if(element.addEventListener) {
		if(eventName == 'mousewheel') {
			element.addEventListener('DOMMouseScroll', callback, false);
		}
		element.addEventListener(eventName, callback, false);
	} else if(element.attachEvent) {
		element.attachEvent("on" + eventName, callback);
	}
}

function unhookEvent(element, eventName, callback) {
	if(typeof(element) == "string") {
		element = document.getElementById(element);
	}
	if(element == null) {
		return;
	}
	if(element.removeEventListener) {
		if(eventName == 'mousewheel') {
			element.removeEventListener('DOMMouseScroll', callback, false);
		}
		element.removeEventListener(eventName, callback, false);
	} else if(element.detachEvent) {
		element.detachEvent("on" + eventName, callback);
	}
}


function cancelEvent(e, wheeldir) {
	e = e ? e : window.event;
	if(e.stopPropagation) {
		e.stopPropagation();
	}
	if(e.preventDefault) {
		e.preventDefault();
	}
	e.cancelBubble = true;
	e.cancel = true;
	e.returnValue = false;
	if (scrollonoff ==1) {
		scrolloffset = oldscrollwheeloffset;
		stopscroll(wheeldir);
	}
	return false;
}

function scrollwheel(e) {
	if (scrollonoff ==1) {
		e = e ? e : window.event;
		//scrollrichtung: detail = +; wheelData = -;
		var wheeldata = e.detail ? e.detail : (e.wheelDelta*-1);
		if (wheeldata > 0) {
			var wheeldir = -1;
		} else {
			var wheeldir = 1;
		}
		oldscrollwheeloffset = 4;
		scrolloffset = scrollwheeloffset;
		startscroll(wheeldir);
	}
	cancelEvent(e, wheeldir);
}


////////////////////////////////////

//Fenstervariablen
var newWin = '';
var viewerWindow = '';
var winOptions = 'resizable=no,toolbar=no,directories=no,menubar=no,scrollbars=no,statusbar=no,width=800,height=624';

//fenster-funktionen

function openViewer(url) {
	nobox();
	if (viewerWindow.closed == false) {
		viewerWindow.location.href = url;
		viewerWindow.focus();
	} else {
	viewerWindow=window.open(url,'viewerFenster',winOptions)
		viewerWindow.focus();
	}
}

function closeViewer() {
	if (viewerWindow.closed == false) {
		viewerWindow.close();
	}
}

function openWin(url,xdim,ydim) {
	nobox();
	var winOptions = 'resizable=no,toolbar=no,directories=no,';
	winOptions = winOptions + 'menubar=no,scrollbars=no,statusbar=no,';
	winOptions = winOptions + 'width='+xdim+',height=' + ydim;

	if (newWin.closed == false) {
		newWin.location.href = url;
		newWin.focus();
	} else {
		newWin=window.open(url,'neuesFenster',winOptions)
		newWin.focus();
	}
}

function closeWin() {
	if (newWin.closed == false) {
		newWin.close();
	}
}



//sound abspielen
function playNextSong() {
	var flashsongnummer = currseite - 1;
	document.bbplayer.SetVariable("songnummer",flashsongnummer);
	document.bbplayer.SetVariable("nextByHTML",1);
}

function playSong(soundfile,sizeKB,dauerSec,songHTMLname) {
	document.bbplayer.SetVariable("soundfile",soundfile);
	document.bbplayer.SetVariable("sizeKB ",sizeKB);
	document.bbplayer.SetVariable("dauerSec",dauerSec);
	document.bbplayer.SetVariable("songHTMLname",songHTMLname);
}


//mehr text einblenden
function weiterimtext(textnummer) {
	nobox();
	myLayer = findLayer('text'+textnummer+'mehr');
	myLayer.style.display='block';
	checkscroll();
}



//blaettern
function naechsteSeite() {
	nobox();
	currseite ++;
	if (currseite > maxseiten) {
		currseite = 1;
	}

	//bild wechseln
	document.bgimg.src=bgimgarray[currseite].src;//wird oben vorgeladen

	if (currseite == 4) {
		document.logoimg.src=logoschwarz.src;//wird oben vorgeladen
	} else {
		document.logoimg.src='siteimgs/logoweiss.gif';
	}


	//text wechseln und mehrtexte ausblenden
	for (k=1;k<=maxseiten;k++) {
		myLayer = findLayer('text'+k);
		if (k==currseite) {
			myLayer.style.display='block';
		} else {
			myLayer.style.display='none';
		}
		myLayer = findLayer('text'+k+'mehr');
		myLayer.style.display='none';
	}

	//nav ein oder aus
	if (currseite==maxseiten) {
		myLayer = findLayer('navtutto');
		myLayer.style.display='block';
		myLayer = findLayer('naverste');
		myLayer.style.display='none';
	} else {
		myLayer = findLayer('navtutto');
		myLayer.style.display='none';
		myLayer = findLayer('naverste');
		myLayer.style.display='block';
	}

	//farben wechslen
	if (currseite==maxseiten) {
		myLayer = findLayer('bg');
		myLayer.style.background='#fff';
		myLayer.style.background='url('+ bgrand.src +')';
	} else {
		myLayer = findLayer('bg');
		myLayer.style.background='#000';
	}

	//scrollpfeile wechslen
	if (currseite==maxseiten) {
		myLayer = findLayer('scrollpfeile');

		myLayer.innerHTML = '<a class="scrollup" name="scrollup" href="#" onMousedown="startscroll(1)" onMouseup="stopscroll(1)" title="Ben&uuml;tzen Sie auch das Scrollrad Ihrer Maus">&nbsp;<\/a><a class="scrolldown" name="scrolldown" href="#" onMousedown="startscroll(-1)" onMouseup="stopscroll(-1)" title="Ben&uuml;tzen Sie auch das Scrollrad Ihrer Maus">&nbsp;<\/a>';

	//ie-bug: schwarze bg-pfeile nochmals laden
	document.getElementsByName('scrollup')[0].style.backgroundImage = 'url('+ upschwarz.src+')';
	document.getElementsByName('scrolldown')[0].style.backgroundImage = 'url('+ downschwarz.src+')';
	document.getElementsByName('pfeilrechts')[0].style.backgroundImage = 'url('+ rechtsschwarz.src+')';

	} else {
		myLayer = findLayer('scrollpfeile');
		myLayer.innerHTML = '<a class="scrollupweiss" href="#" onMousedown="startscroll(1)" onMouseup="stopscroll(1)" title="Ben&uuml;tzen Sie auch das Scrollrad Ihrer Maus">&nbsp;<\/a><a class="scrolldownweiss" href="#" onMousedown="startscroll(-1)" onMouseup="stopscroll(-1)" title="Ben&uuml;tzen Sie auch das Scrollrad Ihrer Maus">&nbsp;<\/a>';
	}

	//seitenzsahlen updaten
	myLayer = findLayer('seitenzahlen');
	myLayer.innerHTML = currseite + '/' + maxseiten;

	//scroll resetten
	//startscroll(1);
	scrolltext.top = scrollminY;
	checkscroll();

	//neuen sound abspielen
	playNextSong();

	//logo laden und ausblenden
	//in dia-tools.js
	if (currseite==maxseiten) {
		loadAndFade(1);//nicht ausblenden
	} else {
		loadAndFade(0);//ausblenden
	}

}





function setcookie(CookieName, CookieValue, CookieExpireDate)
{
  var EndDatum = '';
  if (CookieExpireDate != false)
  {
    var Datum = CookieExpireDate.split('-');
    var MyExpire = new Date();
    MyExpire.setDate(Datum[0]);
    MyExpire.setMonth(Datum[1] - 1);
    MyExpire.setYear(Datum[2]);
    EndDatum = ";expires=" + MyExpire.toGMTString();
  }
  document.cookie = CookieName + "=" + escape(CookieValue) + EndDatum;
}


function getcookie(CookieName) {
  var dc = "" + document.cookie;
  var Muster = 'dc.match(/' + CookieName + '=(.+)/)';
  eval(Muster);
  var Wert = unescape(RegExp.$1);
  return Wert;
}


function soundOnOff(einaus) {
	setcookie('soundonoff',einaus,false);
}