Zen Lightbox addon [Support Thread]

[taydu]

#prevLink,#nextLink {
background:transparent url(../../template_default/images/lightbox/blank.gif) no-repeat;
display:block;
height:100%;
width:63px;
position:absolute;
top:-25px;
}

seem to work but there a tiny problem, please look at attached image ...

How can I make so i have a complete white box, not just the two rabbit ears