function toggleDisplay( toggleNum )
{
    // Get the div and image
    var div = document.getElementById( 'div' + toggleNum );
    var img = document.getElementById( 'img' + toggleNum );
    if ( div.style.display == '' )
    {
        div.style.display = 'none';
        img.setAttribute( 'src', '/images/navig/sitemap/plus.jpg' );
    }
    else
    {
        div.style.display = '';
        img.setAttribute( 'src', '/images/navig/sitemap/minus.jpg' );
    }
}