have u ever tried install pcmanfm ?
install then run it, go to Edit -> Preferences -> Desktop
if ask about the icon , create files .gtkrc-2.0 at /home/tc
add with gtk-icon-theme-name="gnome"
mark Manage the desktop and show file icons and
mark Show menus provided by WM when desktop is clicked
click OK.
you can drag & drop from pcmanfm to desktop with jwm.
but , wbar is missing although u still can access apps with right-click from mouse.
maybe somebody else can help about it ...