$('ul.mainMenu, ul.sideMenu')
.accordion({
  alwaysOpen: false,
  active: false, 
  autoHeight: false,
  collapsible: true
})
.bind('accordionchange', function(event, ui) {
ui.newHeader.parent().addClass('menuActive');
ui.oldHeader.parent().removeClass('menuActive');

var children = $('h5', ui.newContent);
var first = $(children[0]);
if( children.length < 3  ){
  ui.newContent.css('height','auto');
}

});