#buttons a img { filter: alpha(opacity=20); -moz-opacity: 0.2; opacity: 0.2; }
#buttons a:hover img { filter: alpha(opacity=100); -moz-opacity: 1; opacity: 1; }

.img_ogladaj a img{ filter: alpha(opacity=50); -moz-opacity: 0.5; opacity: 0.5; }
.img_ogladaj a:hover img { filter: alpha(opacity=100); -moz-opacity: 1; opacity: 1; }