site navigation problem

DW MX, (on MacG4) My navigation works fine until i navigate to a sub folder,
then i get the error message: Error Diagnostic Information An error has
occurred. HTTP/1.0 404 Object Not Found All my links are set at Relative to
the Document (menu), not to the site. is this the prob? help? Mg

Also, my P7submenu does not work in IE, but works fine in all other browsers.
Ideas?
Mg