//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);
var ie = (navigator.userAgent.indexOf('MSIE')!=-1);

//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";
	}
}



//umlaute fuer msg-Box (nicht in betrieb)
var ae = String.fromCharCode(228);




//vars fuer pfeile ein-/aus
var contentheight = 0;
var bottomheight = 0;
var margintop = 48;// abstand scrolltext von oben
var scrollonoff = 0;//off

//scroll-variablen
var scrollpos = 0;
var scrollminY = 0;
var scrollmaxY = 0;//wird spaeter ausgerechnet
var scrollflag = 0;
var scrollspeed = 25;
var scrolloffset = 8;
var oldscrolloffset = 8;
var scrollwheeloffset = 20;
var scrolltext = '';
var scrolltarget = 0;
var lineheight = 16;

var ganzzahl = 0;
var rest = 0;

//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) {
	//hoehe inhalt holen und max. scrollpos. ermitteln
	if (dir==-1) {
		checkscroll();
		scrollmaxY = fensterhoehe() - contentheight - bottomheight - lineheight;
	} 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() {

	// hoehe inhaltsfeld
	// hoehe div unten
	//ie
	if (ie4x) {
		contentheight = parseInt(document.all.scrolltext.scrollHeight);
		bottomheight= parseInt(document.all.unten.style.height);
	} else {
		contentheight = parseInt(document.getElementById("scrolltext").offsetHeight);
		bottomheight= parseInt(document.getElementById("unten").style.height);
	}

	//ggf. pfeile ein-/ausblenden
	if (margintop + contentheight + bottomheight > fensterhoehe()) {//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;
	}
}

window.onresize = checkscroll;





//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 = oldscrolloffset;
		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;
		}
		//oldscrolloffset = 4;//(???)
		scrolloffset = scrollwheeloffset;
		startscroll(wheeldir);
	}
	cancelEvent(e, wheeldir);
}


//e-mail
function nachrichtAn(mailname,mailbude,mailkuerzel) {
	var adresse = 'mailto:'+mailname+'@'+mailbude+'.'+ mailkuerzel;
	top.location.href=adresse;
}