#footer
    .left
        div{
            opacity: 0;
            filter: alpha(opacity = 0);
            -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=0)";
}

#footer
    .left
    div:hover{
            opacity: 1;
            filter: alpha(opacity = 100);
            -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";
}