ddaccordion.init({
  headerclass: "expandable", //Shared CSS class name of headers group that are expandable
  contentclass: "categoryitems", //Shared CSS class name of contents group
  revealtype: "click", //Reveal content when user clicks or onmouseover the header? Valid value: "click" or "mouseover
  collapseprev: true, //Collapse previous content (so only one open at any time)? true/false
  defaultexpanded: [0], //index of content(s) open by default [index1, index2, etc]. [] denotes no content
  onemustopen: false, //Specify whether at least one header should be open always (so never all headers closed)
  animatedefault: false, //Should contents open by default be animated into view?
  persiststate: true, //persist state of opened contents within browser session?
  toggleclass: ["", "openheader"], //Two CSS classes to be applied to the header when it's collapsed and expanded, respectively ["class1", "class2"]
  togglehtml: ["prefix", "", ""], //Additional HTML added to the header when it's collapsed and expanded, respectively  ["position", "html1", "html2"] (see docs)
  animatespeed: "normal", //speed of animation: "fast", "normal", or "slow"
  oninit:function(headers, expandedindices){ //custom code to run when headers have initalized
    //do nothing
  },
  onopenclose:function(header, index, state, isuseractivated){ //custom code to run whenever a header is opened or closed
    //do nothing
  }
})