function show(ElementId, LinkElementId)
{
    var htmlElement = document.getElementById(ElementId);
    htmlElement.style.display = "block";
    
    if(LinkElementId != null)
    {
        htmlElement = document.getElementById(LinkElementId);
        htmlElement.style.backgroundImage = "url(images/nav-background2.gif)";
    }
}

function hide(ElementId, LinkElementId)
{
    var htmlElement = document.getElementById(ElementId);
    htmlElement.style.display = "none";
    
    if(LinkElementId != null)
    {
        htmlElement = document.getElementById(LinkElementId);
        htmlElement.style.backgroundImage = "url(images/nav-background.gif)";
    }
}