DOUGLAS STANDING UP FOR CRIPPLED KATHLEEN

MAGNANIMOUS Michael Douglas has offered his support to his frail old friend Kathleen Turner, who's suffering from an advanced case of rheumatoid arthritis.

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Despite their adversarial relationships onscreen, the former co-stars, who headlined the '80s blockbusters Romancing the Stone, The Jewel of the Nile and The War of the Roses, have been close pals for 40-plus years.

Sources confide to The National ENQUIRER Michael, 80, wants Kathleen, 70, to know he's there for her. "He worries about her.