function popupWindow(SeitenURL, window_width, window_height, scroll_bar) {
		var top_margin = (screen.height - window_height) / 2;
		var left_margin = (screen.width - window_width) / 2;
		newWindow = window.open(SeitenURL, "newWindow", "width=" + window_width
		+ ",height=" + window_height
		+ ",scrollbars=" + scroll_bar
		+ ",left=" + left_margin
		+ ",top=" + top_margin);
		newWindow.focus();
}

function popupPicture(SeitenURL, window_width, window_height, scroll_bar) {
		window_width *= 1;
		window_width += 30;
		window_height *= 1;
		window_height += 55;
		var top_margin = (screen.height - window_height) / 2;
		var left_margin = (screen.width - window_width) / 2;

	newWindow = window.open(SeitenURL, "newWindow", "width=" + window_width 
				+ ",height=" + window_height
				+ ",scrollbars=" + scroll_bar
				+ ",left=" + left_margin
				+ ",top=" + top_margin);
	
	//newWindow.moveTo(left_margin,top_margin);
	//newWindow.resizeTo(window_width, window_height);
	newWindow.focus();
}