function HideMiddleItemBody(index)
{
    var element = document.getElementById("middleItemBody" + index);
    var middleItemIcon = document.getElementById("middleItemIcon" + index);
    if( element )
    {
        if( (element.style.display == 'block') )
        {
            element.style.display = 'none';
            if( middleItemIcon ) middleItemIcon.className = 'middleItemIcon itemBtnClosed';
        }
        else
        {
            element.style.display = 'block';
            if( middleItemIcon ) middleItemIcon.className = 'middleItemIcon itemBtnOpen';
        }
    }
}