/*.gallerycontainer{ }
.gallerycontainer img{ border:1px solid #000; }
.thumbnail img{ border:1px solid #000; }
.thumbnail:hover{ background-color:transparent; }
.thumbnail:hover img{ border:1px solid #000000; }
.thumbnail span{ position:absolute; visibility:hidden; color:black; background:#ffffff; text-decoration:none; z-index:-1; }
.thumbnail:hover span{ visibility:visible; z-index:1; cursor:pointer; }


.gallerycontainer{ z-index:-1;}
.gallerycontainer img{ border:1px solid #000; }
.thumbnail img{ border:1px solid #000; }
.thumbnail #image_a{ display:block; z-index:-1; }
.thumbnail #image_b{ display:none; z-index:1; }
.thumbnail:hover{ background-color:transparent; }
.thumbnail:hover #image_a{ display:none; z-index:-1; }
.thumbnail:hover #image_b{ display:block; position:relative; z-index:1; }*/