function OeffneFenster(url, name, breite, hoehe, scroll, resizable, bild, alttext) {
	if(!breite) {breite = 851;}
	if(!hoehe) {hoehe = 851;}
	if(!scroll) {scroll = 0;}
	if(!resizable) {resizable = 0;}
	breite = breite +90;
	hoehe = hoehe;
	var oBrowser = new BrowserProps();//
	var iWidth = oBrowser.ScreenAvailWidth;
	var iHeight = oBrowser.ScreenAvailHeight;
	var iLeft = (iWidth-breite)/2;
	var iTop = (iHeight-hoehe)/2;
	if (iLeft<0) iLeft = 0;
	if (iTop<0) iTop = 0;
	var win = window.open("/"+url+"?bild="+bild+"&alttext="+alttext, name, "toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars="+scroll+",resizable="+resizable+",dependent=yes,hotkeys=no,width="+breite+",height="+hoehe+",screenX=" + iLeft + ",screenY=" + iTop + ",left=" + iLeft + ",top=" + iTop);
	win.focus();
}

function BrowserProps() {
	if (navigator.userAgent.indexOf("Opera")>-1) {
		this.ScreenAvailWidth = top.window.innerWidth;
		this.ScreenAvailHeight = top.window.innerHeight;
	} else {
		this.ScreenAvailWidth = screen.availWidth;
		this.ScreenAvailHeight = screen.availHeight;
	}
}