function opacity(id, opacStart, opacEnd, millisec) {
    var speed = Math.round(millisec / 100);
    var timer = 0;

    if(opacStart > opacEnd) {
        for(i = opacStart; i >= opacEnd; i--) {
            setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
			i--;
            timer++;
        }
    } else if(opacStart < opacEnd) {
        for(i = opacStart; i <= opacEnd; i++)
            {
            setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
			i++;
            timer++;
        }
    }
}

function changeOpac(opacity, id) {
    var object = document.getElementById(id).style;
    object.opacity = (opacity / 100);
    object.MozOpacity = (opacity / 100);
    object.KhtmlOpacity = (opacity / 100);
    object.filter = "alpha(opacity=" + opacity + ")";
}


changetime = 6000;
next = "1";
last = "0";


function refchange(){
changeOpac(0, "bild"+next);
opacity("bild"+next, 0, 100, changetime);

	if(last > 0){
    	opacity("bild"+last, 100, 0, changetime*2);
	}

		last = next;
		next++;



	if(next == anz){
		next = "1";
	}

setTimeout("refchange();",4500);
}