function topmenu(nontarget){
  //var nontarget = null;
  $("#topmenu li a").hover(function(){
    var liindex = $("#topmenu li a").index(this);
    if(liindex == nontarget){
      return;
    }
    var backgroundimageurl = "";
    backgroundimageurl = "url(/common/image/topleft0" + liindex + "on.png)";
    $(this).addClass("overon");
    $("#leftbox div").eq(liindex).css("background-image",backgroundimageurl);
    $("#leftbox div").eq(liindex).animate(
      {opacity: 1},
      {duration: 300,
       easing: "swing",
       queue:true
      }
    );
  },function(){
    var liindex = $("#topmenu li a").index(this);
    if(liindex == nontarget){
      return;
    }
    //alert($("#topmenu li a").index(this));
    $(this).removeClass("overon");
    $("#leftbox div").eq(liindex).animate(
      {opacity: 0},
      {duration: 300,
       easing: "swing",
       queue:true
      }
    );
  });
  //leftオブジェクト用イベント設定
  $("#leftbox div").hover(function(){
    var liindex = $("#leftbox div").index(this);
    if(liindex == nontarget){
      return;
    }
    var backgroundimageurl = "";
    backgroundimageurl = "url(/common/image/topleft0" + liindex + "on.png)";
    $(this).css("background-image",backgroundimageurl);
    $("#topmenu li a").eq(liindex).addClass("overon");
    $(this).animate(
      {opacity: 1},
      {duration: 300,
       easing: "swing",
       queue:true
      }
    );
  },function(){
    var liindex = $("#leftbox div").index(this);
    if(liindex == nontarget){
      return;
    }
    $("#topmenu li a").eq(liindex).removeClass("overon");
    $(this).animate(
      {opacity: 0},
      {duration: 300,
       easing: "swing",
       queue:true
      }
    );
  });
}