This was already covered at least once before. In lightbox.css get rid of the red part and add the green:
Code:
#prevLink, #nextLink{
width: 49%;
height: 100%;
background: transparent url(../images/blank.gif) no-repeat; /* Trick IE into showing hover */
display: block;
}
#prevLink { left: 0; float: left; background: url(../images/prevlabel.gif) left 15% no-repeat;}
#nextLink { right: 0; float: right; background: url(../images/nextlabel.gif) right 15% no-repeat;}
#prevLink:hover, #prevLink:visited:hover { background: url(../images/prevlabel.gif) left 15% no-repeat; }
#nextLink:hover, #nextLink:visited:hover { background: url(../images/nextlabel.gif) right 15% no-repeat; }
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