If you mean how to have all the headers of the menu expanded by default when the page loads, just specify this in the initialization code:
Code:
ddaccordion.init({
headerclass: "submenuheader", //Shared CSS class name of headers group
contentclass: "submenu", //Shared CSS class name of contents group
revealtype: "click", //Reveal content when user clicks or onmouseover the header? Valid value: "click" or "mouseover
collapseprev: false, //Collapse previous content (so only one open at any time)? true/false
defaultexpanded: [0,1,2], //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: false, //persist state of opened contents within browser session?
Note the lines in red.
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