//grosses bild onclick
function do_pic(x) {
	if ((navigator.appName == "Netscape") && (parseInt(navigator.appVersion)  <= 4 )){
		document.layerbg.document.gross.document.step.src = "/_pix/step/" + x + ".jpg";
	} else {
		document.step.src = "/_pix/step/" + x + ".jpg";
	}
}