.imgsd img{
filter:progid:DXImageTransform.Microsoft.Alpha(opacity=100);
-moz-opacity: 1;
border: 2px solid #646464;
}

.imgsd:hover img{
filter:progid:DXImageTransform.Microsoft.Alpha(opacity=80);
-moz-opacity: 0.80;
border: 2px solid #646464;
}