function toggle_visibility(hideorshow, elem)
{
    var e = document.getElementById(elem);
    if (hideorshow == 'hide')
    {
		e.style.visibility = 'hidden';
		e.style.display = 'none';
    }
    else
    {
        e.style.visibility = 'visible';
		e.style.display = 'block';
    }
}