use the -intialdir option. As it says in the man page:
-initialdir directory
Specifies that the files in directory should be displayed when the dialog pops up. If this parameter is not specified, then the files in the current working directory are displayed. If the parameter specifies a relative path, the return value will convert the relative path to an absolute path. This option may not always work on the Macintosh. This is not a bug. Rather, the General Controls control panel on the Mac allows the end user to override the application default directory.
Bob Rashkin
rrashkin@csc.com