Nested Frames
You can put the menu in any frame, and let its popup menus show in the target frame.
Generally, there are 3 types of DHTML menu in nested frameset.
First Type: place menu in topFrame and let the popup menu settings shown in rightFrame.
View the sample and its tutorial
http://www.sothink.com/product/dhtmlmenu/store/crossframe/nestedframe/toptobottom/index.htm
Second Type: place menu in leftFrame and let the popup menu settings shown in rightFrame.
View the sample and its tutorial
http://www.sothink.com/product/dhtmlmenu/store/crossframe/nestedframe/lefttoright/index.htm
Third Type: place menu in rightFrame and let the popup menu settings shown in topFrame.
View the sample and its tutorial
http://www.sothink.com/product/dhtmlmenu/store/crossframe/nestedframe/bottomtotop/index.htm