Required library edition:
Required library file: dhtmlxaccordion.js

enables multimode in accordion (disabled by the default)

    var dhxAcc = new dhtmlXAccordion(...);
    // first enabling multimode
    dhxAcc.enableMultiMode(true);
    // then adding items
    dhxAcc.adItem("item_a", "The Secret of Monkey Island");
    dhxAcc.adItem("item_b", "Monkey Island 2: LeChuck's Revenge");
    dhxAcc.adItem("item_c", "The Curse of Monkey Island");
    ...