The selection you make from this menu determines which events appear on the Events pop-up menu. Events Displays all the events that can trigger the action. Different events appear depending on the object selected. If the expected events don't appear, make sure that the correct object is selected. Use the tag selector at the bottom left of the Document window to select a specific tag.
Different browsers recognize different events for various objects.
Choose the browsers in which you want the behavior to work from the Show Events For pop-up menu. Only the events recognized by the selected browsers appear on the Events menu. Up and Down arrows Move the selected action up or down in the behavior list. Actions are executed in the specified order.