用 CSS 控制链接图片翻转

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#emailUs
{
  display: block;
  width: 107px;
  height: 23px;
  background: url("emailUs.gif") no-repeat 0 0;

}

#emailUs:hover
{ 
  background-position: 0 -23px;
}

#emailUs span
{
  position: absolute;
  top: -999em;
}