@fat: 0; @cloudhead: “#000000”;

.nav {

filter: progid:DXImageTransform.Microsoft.Alpha(opacity = 20);
filter: progid:DXImageTransform.Microsoft.Alpha(opacity=@fat);
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr="#333333", endColorstr=@cloudhead, GradientType=@fat);

}