Timed capture works best when any mouse click or key use would change the screen you are trying to capture, such as tooltips, pop-up windows, or menus.
To use timed capture to capture screen images
On the Capture menu, click Using a Timer.
in the Delay box, select the number of seconds for HTML Help Image Editor to wait before the capture.
In the Window to Capture area, select either Desktop or Window under cursor, and then click OK.