function toggleContent(targetDiv, triggerDiv) {
    if (getImageName(document.images[triggerDiv].src) == 'expand') {
        Effect.SlideDown(targetDiv);
        document.images[triggerDiv].src = 'images/collapse.gif';
    }
    else {
        Effect.SlideUp(targetDiv);
        document.images[triggerDiv].src = 'images/expand.gif';
    }
}

function getImageName(imgPath) {
    var d = imgPath.lastIndexOf('.');
    return imgPath.substring(imgPath.lastIndexOf('/') + 1, d < 0 ? imgPath.length : d);
}