function ToggleBlock(id)
{
    var el = document.getElementById(id);
    var icon = document.getElementById(id + "_icon");
    var iconLink = document.getElementById(id + "_icon_link");
    var textLink = document.getElementById(id + "_text_link");
    
    if (el != null && icon != null && iconLink != null && textLink != null)
    {
        ShowBlock(el, icon, iconLink, textLink);
    }
    
    return false;
}

function ShowBlock(el, icon, iconLink, textLink)
{
    el.style.display = "block";
    icon.src = "/images/minus.gif";
    iconLink.onclick = textLink.onclick = function() { return HideBlock(el, icon, iconLink, textLink); };
    return false;
}

function HideBlock(el, icon, iconLink, textLink)
{
    el.style.display = "none";
    icon.src = "/images/plus.gif";
    iconLink.onclick = textLink.onclick = function() { return ShowBlock(el, icon, iconLink, textLink); };
    return false;
}