function toggleDisplay(element) {
    var style;

    if (typeof element == 'string')
    {
         element = document.getElementById ? document.getElementById(element) : null;
    }
    if (element && (style = element.style))
    {
        	style.display = (style.display == 'none') ? 'block' : 'none';
    }
}

function toggleNoneDisplay(element) {
    var style;

    if (typeof element == 'string')
    {
         element = document.getElementById ? document.getElementById(element) : null;
    }
    if (element && (style = element.style))
    {
        	style.display = 'none';
    }
}