Preview:
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  .section img { 

    left: 0; 

    position:absolute; 

    top: 0; 

}

​

 .section img.one {opacity:0;filter:alpha(opacity=0);}

​

  .section:hover img.one {opacity:1;filter:alpha(opacity=100);}

​

  .section:hover img.two {opacity:0;filter:alpha(opacity=0);}
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