Then create a new table in the layer, enter the contents of each submenu, the font color can be defined as white, and set the pages linked to each submenu. Finally, let's set the behavior of the layer: 1. Select the picture or text in the main menu, open the behavior panel, click+,select "Show-Hide Layer", click the newly created layer (layer 1) in the opened dialog box, click the "Show" button and click "OK"; Change the event to "onmousemove" in the Behaviors panel.