/*****
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

modifiziert von Franziska Maelzer: http://die.netzspielwiese.de/blog/javascript-dom/2006-06/dom-scripting-slideshow
*****/

window.addEventListener?window.addEventListener("load",so_init,false):window.attachEvent("onload",so_init);

var d=document, bilder = new Array(), zInterval = null, aktuell=0, pause=false; bilderAnzahl=10; bilderPfad="http://www.bohn-sport.de/slideshow/"; geschwindigkeit=9000;

function so_init() {
	if(!d.getElementById || !d.createElement)return;	
	
	// erstes Bild wird eingelesen
	bild = d.getElementById("slideshow").getElementsByTagName("img");
	bilder[0] = bild[0];
	bilder[0].style.display = "block";
	bilder[0].xOpacity = .99;

	bilder[1] = new Image();
	bilder[1].src = bilderPfad + "002.jpg";
	bilder[1].xOpacity = 0;
	d.getElementById("slideshow").appendChild(bilder[1]);
	
	setTimeout(so_xfade,geschwindigkeit);
	neuesBild();
}

function so_xfade() {
	cOpacity = bilder[aktuell].xOpacity;
	nIndex = bilder[aktuell+1]?aktuell+1:0;
	nOpacity = bilder[nIndex].xOpacity;
	
	cOpacity-=.05; 
	nOpacity+=.05;
	
	bilder[nIndex].style.display = "block";
	bilder[aktuell].xOpacity = cOpacity;
	bilder[nIndex].xOpacity = nOpacity;
	
	setOpacity(bilder[aktuell]); 
	setOpacity(bilder[nIndex]);
	
	if(cOpacity<=0) {
		bilder[aktuell].style.display = "none";
		aktuell = nIndex;
		setTimeout(so_xfade,geschwindigkeit);
		neuesBild();
	} else {
		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) + ")";
	}	
}

function neuesBild() {
	// immer ein Bild vorausladen
	if ( (aktuell < (bilderAnzahl-2)) && (bilder.length < bilderAnzahl) ) {
		bilder[aktuell+2] = new Image();
		bilder[aktuell+2].src =  bilderPfad + "0" + ((aktuell+3)<10 ? "0" + (aktuell+3) : (aktuell+3)) + ".jpg"
		bilder[aktuell+2].xOpacity = 0;
		d.getElementById("slideshow").appendChild(bilder[aktuell+2]);
	}
}

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