JQuery Lightbox 2 Plugin problem

I'm working on a gallery, which use jQuery Lighbox 2 (plugin page). I have the problem, that the nav开发者_StackOverflow社区igation entries are also visible, when an image is selected (see example here). For the navigation i'm using css menu. Can someone tell me, how to make the enties invisible, when an image was selected?

Set z-index to 5000. in the file lightbox.css

Example:

#lightbox {
    left:0;
    line-height:0;
    position:absolute;
    text-align:center;
    width:100%;
    z-index:5000; /* move the lightbox above all other elements */
}