public static void putBehind() {
		if (IJ.debugMode) IJ.log("putBehind");
		if (imageList.size()<1 || currentWindow==null)
			return;
		int index = imageList.indexOf(currentWindow);
		ImageWindow win = null;
		int count = 0;
		do {
			index--;
			if (index<0) index = imageList.size()-1;
			win = (ImageWindow)imageList.elementAt(index);
			if (++count==imageList.size()) return;
		} while (win instanceof HistogramWindow || win instanceof PlotWindow);
		if (win==null) return;
		ImagePlus imp = win.getImagePlus();
		if (imp!=null)
			IJ.selectWindow(imp.getID());
    }