After a user selects a jump menu item, there is no way to reselect that menu item if the user navigates back to that page, or if the Open URL In box specifies a frame. There are two ways to work around this problem:
Use a menu selection prompt, such as a category, or a user instruction, such as “Choose one”. The menu selection prompt is reselected automatically after each menu selection.
Use a Go button, which allows a user to revisit the currently chosen link. When you use a Go button with a jump menu, the Go button becomes the only mechanism that “jumps” the user to the URL associated with the selection in the menu. Selecting a menu item in the jump menu no longer re-directs the user automatically to another page or frame.