accordion content disappears after operating two times only in ie6

i am using jquery 1.3.2 and ui.core.js and ui.accordian.js. the content of the accordian disappears after operating twice..

// Accordion

("#accordion").accordion({ header: "h3",autoHeight:false });

});

ie is not showing any error.only the content disappears

if autoheight is removed,everything remains fine.but the content is in one pane is large so i need autoheight...