function rolloverActivate(){return false};
function rolloverDeactivate(){return false};
activate   = rolloverActivate;
deactivate = rolloverDeactivate;

if ( document.images ) {
    var rolloverImages   = new Object();
    var rolloverIsCached = new Object();
}

function rolloverLoad( rolloverList ) {
    for ( var imageName in rolloverList ) {
        rolloverImages[imageName]   = new Rollover( imageName, rolloverList[imageName][0], rolloverList[imageName][1] );
        rolloverIsCached[imageName] = true;
    }
    return true
}

function rolloverActivate( imageName ) {
    if ( document.images && rolloverIsCached[imageName] ) {
        document.images[imageName].src = rolloverImages[imageName].active.src;
    }
    return true;
}

function rolloverDeactivate( imageName ) {
    if ( document.images && rolloverIsCached[imageName] ) {
        document.images[imageName].src = rolloverImages[imageName].inactive.src;
    }
    return true;
}

function Rollover( name, width, height ) {
    this.inactive     = new Image( width, height );
    this.inactive.src = "/images/"  + name + ".gif";
    this.active       = new Image( width, height );
    this.active.src   = "/images/rollovers/" + name + ".gif";
    return true;
}