$( function() { 
  
  $('#select_chapter').combobox(
	 { 
	 comboboxContainerClass: "comboboxContainer", 
	 comboboxValueContainerClass: "comboboxValueContainer", 
	 comboboxValueContentClass: "comboboxValueContent", 
	 comboboxDropDownClass: "comboboxDropDownContainer", 
	 comboboxDropDownButtonClass: "comboboxDropDownButton", 
	 comboboxDropDownItemClass: "comboboxItem", 
	 comboboxDropDownItemHoverClass: "comboboxItemHover", 
	 comboboxDropDownGroupItemHeaderClass: "comboboxGroupItemHeader", 
	 comboboxDropDownGroupItemContainerClass: "comboboxGroupItemContainer",
	 animationType: "slide",
	 width: "358px" 
	 }
  );  

  });