jquery.fn.accordion = function(){
    var $accordion = $(this);
    $accordion.children().addclass("list1");
    $accordion.children().children("div").addclass("list2");
    $accordion.on("click",".list1>p",function(){
        if($(this).next(".list2").is(":visible")){
            $(this).next(".list2").slideup();
        }else{
            $(this).next(".list2").slidedown();
            $(this).parent().siblings(".list1").children(".list2").slideup();
        }
    });
}