.type-attachs a {
    padding-left: 25px;
    background-image: url('unknown.gif');
    background-repeat: no-repeat;
    background-position: left center;
}
.type-images a {
    padding-left: 25px;
    background-image: url('image2.gif');
    background-repeat: no-repeat;
    background-position: left center;
}
.type-gallery a {
    padding-left: 25px;
    background-image: url('folder.gif');
    background-repeat: no-repeat;
    background-position: left center;
}