Marlet, who has scored two goals for Fulham this season, was joined on the scoresheet by Patrick Vieira, Sylvain Wiltord and Sidney Govou.
The victory took the French sides points tally in the Euro 2004 qualifiers to a maximum of six points from their Group One campaign, following on from last month's 2-1 defeat of Cyprus.
Their next game is on Wednesday against Malta.
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