Milonic - Another excellent, free program that you can download at milonic. It is the light blue menu above. A sample menu, the necessary .js files, and associated graphics are included in the zip file. Only one of the .js files need be modified to fit your needs. But, like all DHTML files, it will take a bit of time to learn how to modify the file for your specific menu needs.
The zip file also includes eight graphics that are used, or can be used, in the menu, e.g. down arrow graphic, so the visitor will know that a sub-menu is present or a right arrow to indicate additional menu. Some of the graphic arrows are used during a mouse over for additional effect.
All in all, this is an excellent menu but not for the faint of heart! It will take time and effort to learn how to modify the sample html file for your needs.
The sample menu is set up to appear 200 pixels from the left side and 20 pixels down from the top of the screen. It will take some trial and error to figure out exactly what these numbers should be for your menu position. For example, the sample menu above use 250 pixels from the left side and 10 pixels down from the top of the page so it will appear where you see it above.