// show & hide blurb
function toggleBlurb()
{
    var blurb = document.getElementById('blurb');
    
    if (blurb.style.visibility == 'visible')
    {
        blurb.style.visibility = 'hidden';
    }
    else
    {
        blurb.style.visibility = 'visible';
    }
}

// rooover image
function buttonOver(obj, file)
{
    obj.src = file;
}

// return height of document
function footerRelocate()
{
    // docY = document size
    // winY = window size
    // obj = obj of footer bg

    var docY = document.body.offsetHeight;
    var winY = document.documentElement.clientHeight;
    var obj = document.getElementById('footerbg');
    
    if (docY < (winY))
    {
        obj.style.position = 'absolute';
    } else
    {
        obj.style.position = 'relative';
    }
}