function switchImage( ref, width, height )
{
    if ( !document.getElementById ) return true;
    var url = ref.getAttribute('href');
    var image = document.getElementById('studyimage');
    if ( image ) {
        image.setAttribute('src', url);       
        image.setAttribute('width', width);
        if ( height > 0 )
        {
            image.setAttribute('height', height);
        }
    } else {
        return true;
    }
    return false;
}