http://usidegaraj.5com.ro/galerie.html There's an extra space between the thumbnail and the button, and i have no idea why.
Try this.. make margin:-5px 0; for class="butonel1" I know setting margin to -5px is not good, but it solves ur problem.
The gap under the image is there because it's supposed to be there by default. Set img {vertical-align: bottom;}. Do not mess with margin; that can cause other issues, and don't forget to remove it when you correct the vertical-align. See my Mysterious gap under images article for the reasons. Also, you'd be better off using inline-block instead of floating your gallery. See The Inline-Block Thumbnail Gallery for a more robust method. cheers, gary