JQuery显示隐藏层

$(document).ready(function(){
  $(a).click(function(e){
        if($("#sunfishlu").css("display")=="none")
        {
            $("#sunfishlu").show("slow");
            //$("#sunfishlu").css("display","block");
        }
        else
        {
            $("#sunfishlu").hide("slow");
            //$("#sunfishlu").css("display","none");
        }
    });
});