/*****

Image Cross Fade Redux
Version 1.0
Last revision: 02.15.2006
steve@slayeroffice.com

Please leave this notice intact. 

Rewrite of old code found here: http://slayeroffice.com/code/imageCrossFade/index.html


*****/


window.onload = function() {
	setTimeout(so_init,3000);
	document.getElementById('i_stadt').options[0].selected = true;
	document.getElementById('i_bezirk').options[0].selected = true;
}
//window.addEventListener?window.addEventListener("load",so_init,false):window.attachEvent("onload",so_init);

var d=document, imgs = new Array(), zInterval = null, current=0, pause=false;
var steps = 1;
var timeInterval = 1000; //1 Sekunde
var switcher = false;

/**
 * Quelle: http://home.arcor.de/xbo/events-ohne-onfoo/
 * @param {Object} obj
 * @param {Object} evType
 * @param {Object} fn
 */
function removeEvent(obj, evType, fn){
  if (obj.removeEventListener){
    obj.removeEventListener(evType, fn, false);
    return true;
  } else if (obj.detachEvent){
    var r = obj.detachEvent("on"+evType, fn);
    return r;
  } else {
    return false;
  }
}

function meins() {
	so_init();
}

function ret() {
	var imgs_copy = new Array();
	imgs = d.getElementById("pic_col"+String(steps)).getElementsByTagName("img");
	var j = imgs.length-1;
	for(i=0;i<imgs.length;i++) {
		imgs_copy[j] = imgs[i];
		j--;
	}
	return imgs_copy;
}

function so_init() {
	if(!d.getElementById || !d.createElement)return;

	// DON'T FORGET TO GRAB THIS FILE AND PLACE IT ON YOUR SERVER IN THE SAME DIRECTORY AS THE JAVASCRIPT!
	// http://slayeroffice.com/code/imageCrossFade/xfade2.css
	/*css = d.createElement("link");
	css.setAttribute("href","xfade2.css");
	css.setAttribute("rel","stylesheet");
	css.setAttribute("type","text/css");
	d.getElementsByTagName("head")[0].appendChild(css);*/

if (!d.getElementById("pic_col"+String(steps))) {
	steps=1;
	switcher = switcher?false:true;
}
	imgs = d.getElementById("pic_col"+String(steps)).getElementsByTagName("img");
if (switcher == false) {
	for(i=1;i<imgs.length;i++) imgs[i].xOpacity = 0;
	imgs[0].style.display = "block";
	imgs[0].xOpacity = .99;
} else {
	imgs=ret();
	for(i=1;i<imgs.length;i++) imgs[i].xOpacity = 0;
	imgs[0].style.display = "block";
	imgs[0].xOpacity = .99;
}
	
	aktiv = window.setTimeout(so_xfade,timeInterval);
}

function so_xfade() {
	cOpacity = imgs[current].xOpacity;
	nIndex = imgs[current+1]?current+1:0;

if (nIndex == 0) {
	steps++;
	window.clearTimeout(aktiv);

	imgs[nIndex].style.display = "block";
	imgs[current].xOpacity = cOpacity;
	imgs[nIndex].xOpacity = nOpacity;
	setOpacity(imgs[current]); 
	setOpacity(imgs[nIndex]);

	nIndex = 0;
	current = 0;
	setTimeout(meins,timeInterval);
	return;
}

	nOpacity = imgs[nIndex].xOpacity;
	
	cOpacity-=.03; 
	nOpacity+=.03;
	
	imgs[nIndex].style.display = "block";
	imgs[current].xOpacity = cOpacity;
	imgs[nIndex].xOpacity = nOpacity;
	
	setOpacity(imgs[current]); 
	setOpacity(imgs[nIndex]);
	
	if(cOpacity<=0) {
		//imgs[current].style.display = "none";
		current = nIndex;
		aktiv = window.setTimeout(so_xfade,timeInterval);
	} else {
		aktiv = window.setTimeout(so_xfade,50);
	}
	
	function setOpacity(obj) {
		if(obj.xOpacity>.99) {
			obj.xOpacity = .99;
			return;
		}
		obj.style.opacity = obj.xOpacity;
		obj.style.MozOpacity = obj.xOpacity;
		obj.style.filter = "alpha(opacity=" + (obj.xOpacity*100) + ")";
	}
	
}