In magic-gallery/css/lightbox.css try to change the padding-bottom value from 0.7em to 1.7em. Worked for me.
#imageData #bottomNavClose{ width: 66px; float: right; padding-bottom: 1.7em; outline: none; background: url(../images/closelabel.gif) left 15% no-repeat;}
Still, in Internet Explorer 8 the close-button looks funny. Like there’s a broken link image 28×30 on top of the close-image.
