function hideMe (whichLayer) {
    var elev, vis;
    elem = document.getElementById(whichLayer);
    vis = elem.style;
    vis.display = 'none';
}

function showMe (whichLayer) {
    var elev, vis;
    elem = document.getElementById(whichLayer);
    vis = elem.style;
    if (whichLayer == "mainPerformances") {
        vis.display = 'block';
        vis.overflow = 'auto';
    } else if (whichLayer == "mainAbout") {
        vis.display = 'block';
        vis.overflow = 'auto';
    } else {
        vis.display = 'inline';
    }
}

function toggleLayer(whichLayer) {
    var elem, vis;
    if( document.getElementById ) // this is the way the standards work
        elem = document.getElementById( whichLayer );
    else if( document.all ) // this is the way old msie versions work
        elem = document.all[whichLayer];
    else if( document.layers ) // this is the way nn4 works
        elem = document.layers[whichLayer];
    vis = elem.style;
    // if the style.display value is blank we try to figure it out here
    if(vis.display==''&&elem.offsetWidth!=undefined&&elem.offsetHeight!=undefined)
        vis.display = (elem.offsetWidth!=0&&elem.offsetHeight!=0)?'block':'none';
    vis.display = (vis.display==''||vis.display=='block')?'none':'block';
}