Sample: dhtmlxAccordion Setting Open Effect dhtmlxAccordion main page
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<script>
 
    // initialization
    var dhxAccord = new dhtmlXAccordion("accordObj");
    ...
    // enabling an effect (disabled by the default)
    dhxAccord.setEffect(true);
    // disabling an effect
    dhxAccord.setEffect(false);
</script>