function changeProjektePic(welches) {
	var pictures = document.getElementById("projekte_bilder").getElementsByTagName("IMG");
	var texte = document.getElementById("projekte_text").getElementsByTagName("DIV");
	for (var i=0;i<pictures.length;++i) {
		if (i+1==welches) {
			pictures[i].style.display = "block";
			texte[i].style.display = "block";
			document.getElementById("zaehler").getElementsByTagName("SPAN")[0].innerHTML = 	"  "+(i+1)+"/"+pictures.length;
		} else {
			pictures[i].style.display = "none";
			texte[i].style.display = "none";			
		}
	}
}

function changeProjektePfeile(richtung) {
	var adder = 0;
	if (richtung == "vor") {adder = 1;} else { adder = -1; }
	var pictures = document.getElementById("projekte_bilder").getElementsByTagName("IMG");
	var texte = document.getElementById("projekte_text").getElementsByTagName("DIV");
	for (var i=0;i<pictures.length;++i) {
		if (pictures[i].style.display != "none") {
			if (i == 0 && richtung != "vor") {
				changeProjektePic(pictures.length);
			} else if (i == pictures.length-1 && richtung == "vor") {
				changeProjektePic(1);
			} else {
				changeProjektePic((i+1)+adder);				
			}
			break;
		}
	}
}

function countSteps() {
	var pictures = document.getElementById("projekte_bilder").getElementsByTagName("IMG");
	document.getElementById("zaehler").getElementsByTagName("SPAN")[0].innerHTML = 	"  1/"+pictures.length;
}