div.slideshow {
    background: url('/images/landing/parking/custom_parking_signs-1.jpg') top left no-repeat; /* for the loading image */
    width: 608px; /* same as images */
    height: 161px; /* same as images */
    line-height: 0; /* fix IE space below image */
}
div.slideshow img {
    opacity: 0; /* So it doesn't show while loading */
    filter: alpha(opacity=0); /* the same, for IE */
}