現(xiàn)在是鼠標(biāo)必須要放到小圖標(biāo)上 才能進(jìn)行圖片切換，用戶體驗(yàn)太差，如何在鼠標(biāo)放到li的時(shí)候就能切換

   .showImage{
        overflow:hidden;
        margin: 0 auto ;
        background-image: url(../img/nav_bg.png) ;
        background-repeat:no-repeat;
        width: 22px;
        height: 22px;
    }
    li:hover{
        overflow:hidden;
        margin: 0 auto ;
        background-image: url(../img/nav_bg.png) ;
        background-repeat:no-repeat;
        width: 22px;
        height: 22px;
    }
/*    .showImage:hover{
        background-image: url(../img/nav_bg.png);
    }*/
    .item0{
      background-position: -235px -17px ;
    }
    .item0:hover{

      background-position: -235px -55px ;
    }
    .item1{
      background-position: -19px -17px ;
    }
    .item1:hover{
      background-position: -19px -55px ;
    }
    .item2{
      background-position: -63px -17px ;
    }
    .item2:hover{
      background-position: -63px -55px ;
    }
    .item3{
      background-position: -108px -17px ;
    }
    .item3:hover{
      background-position: -108px -55px ;
    }
    .item4{
      background-position: -152px -17px ;
    }
    .item4:hover{
      background-position: -152px -55px ;
    }
    .item5{
      background-position: -197px -17px ;
    }
    .item5:hover{
      background-position: -197px -55px ;
    }