$(document).ready(function() {

$("#nav ul li").hover(function() {   
$(this).find("div a").css({ "color": "#fff", "font-weight": "", "background-image": "url(../picture/1_07.jpg)","background-repeat": "no-repeat" });

        var dl = $(this).find("dl");
       // dl.css({"display":"none"});
dl.find("dd a").css({"background-image": "none","text-align":"center","color":"#0d527d"});
        dl.slideDown(300);

    }, function() {

    $(this).find("div a").css({ "color": "#0d527d", "font-weight": "", "background-image": "none","color":"#0d527d" });
  //  dl.find("dd a").css({"background-image": "none","text-align":"left","display":"none"});
        $(this).find("dl").slideUp(200);
         //   $(this).find("dl").attr("style","display:none");

    })
})