$(function(){
$("#mouseman a").mouseover(function(){
var mouseman=$("#"+$(this).attr("id")+" "+"img");
switch($(this).attr("id")){
 case "menu_01":mouseman.attr("src","image/menu_01_on.png");$("#backman01").attr("src","image/menu_on_back.png");break;
 case "menu_02":mouseman.attr("src","image/menu_02_on.png");$("#backman02").attr("src","image/menu_on_back.png");break;
 case "menu_03":mouseman.attr("src","image/menu_03_on.png");$("#backman03").attr("src","image/menu_on_back.png");break;
 case "menu_04":mouseman.attr("src","image/menu_04_on.png");$("#backman04").attr("src","image/menu_on_back.png");break;
 case "menu_05":mouseman.attr("src","image/menu_05_on.png");$("#backman05").attr("src","image/menu_on_back.png");break;
 case "menu_11":mouseman.attr("src","image/menu_11_on.png");$("#backman06").attr("src","image/menu_on_back.png");break;
 case "menu_06":mouseman.attr("src","image/menu_06_on.png");$("#backman07").attr("src","image/menu_on_back.png");break;
 case "menu_07":mouseman.attr("src","image/menu_07_on.png");$("#backman08").attr("src","image/menu_on_back.png");break;
 case "menu_12":mouseman.attr("src","image/menu_12_on.png");$("#backman09").attr("src","image/menu_on_back.png");break;
 default:alert("dddd");
 }}).mouseout(function(){
  var mouseman=$("#"+$(this).attr("id")+" "+"img");
  mouseman.attr("src","image/"+$(this).attr("id")+".png");
  $(".backman").attr("src","image/menu_back.png");});
});