Running a dbms_job at 6AM every working day ?

What would be the INTERVAL expression for this ? (Monday to Friday)

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Jan-Olav Eide                    __O   Senior Research Scientist
Norwegian Computing Center     _`\<,_  Phone : 22852646, Fax : 22697660
Gaustadalléen 23, P.O Box 114 (*)/ (*) Email : Jan.Olav.Eide_at_nr.no
Blindern, 0314 Oslo, Norway            www.nr.no/~janolav/index.html