Drop down pop up menus

[florida]

I need to get a pop up drop down script that will always show on the page where if you drop down the menu at the end of a page or edge of the browser window it will show the menu inside your browser and not disapear outside of browser window. I tried to find one on dynamicdrive javascript site but all of the pop up drop down menus disappear outside of browser window if you too close to window edge. I need something like what is on this site:

http://www.skytel.com/

where the drop down pop up menus always stay in the browser window but the javascript source is not available.
Anyone know where I can get this JavaScript??

[Xin]

i think the HM menu on webreference.com can handle that, but you might need to pay for a license to use it.

or you can try a free alternative. just take a look at this example:
http://www.yxscripts.com/menuG5/examples/style.html

scroll down to the bottom of the page, click the "Click Me" link to pop up the menu bar, narrow down your browser window to see how the sub-menus try to stay in view (they should open to upside by the setting). if a sub-menu is too long to fit into the browser window, mouseover the menu item next to the browser border for a while and the menu will scroll the rest of items into view.

enjoy.