function rollOver( element, image, hover ) {
    element.src = "media/images/menu." + image + "." + ( hover ? "hover" : "link" ) + ".gif";
}

function expand( element, glyph ) {
    if( document.getElementById( element ).style.display == "none" ) {
        document.getElementById( element ).style.display = "inline-block";
        document.getElementById( glyph ).src = "media/images/minus.gif";
    } else {
        document.getElementById( element ).style.display = "none";
        document.getElementById( glyph ).src = "media/images/plus.gif";
    }
}