function fenster(fUrl) {
		var win = window.open(fUrl, "_blank" , "width=740 , height=430");
}
function fenster2(fUrl, fWidth, fHeight) {
		var win = window.open(fUrl, "_blank", "width=" + fWidth + ", height=" + fHeight);
}
function openVideoWin(vUrl) {
		w = 500;
		h = 400;
		sw = screen.availWidth;
		sh = screen.availHeight;
		var vwin = window.open(vUrl, "_blank", "width=500, height=400, menubar=no, scrollbars=no"); 
		vwin.moveTo((sw - w) / 2, (sh - h) / 2);
}