Jquery accordion style menu panel state JavaScript

function displayAccordion() {
 $("#accordion-nav div ul").each(
  function(){
   if ($(this).find('a').filter(
    function(){
     if(window.location.toString().match(/f\?p=\d+:(\d+):/)[1] == $(this).attr('href').match(/f\?p=\d+:(\d+):/)[1] ){
      $(this).addClass('is-lvl2-current');
      return true;
     } else {
      $(this).removeClass('is-lvl2-current');
      return false;
     }
    }).length > 0) {
   $(this).slideDown(1)
   } else {
    $(this).slideUp(1)
   };
  }
 );
}

apex.jQuery("#accordion-nav").ready(function(){displayAccordion()});