function ToggleElement(elementId, imageId)
{
    var elPanel = document.getElementById(elementId);
    var elImage = document.getElementById(imageId);
    
    if( elPanel == null || elImage == null ) return;
    
    if( elPanel.style.display != "none" )
    {
        elPanel.style.display = "none";
        elImage.src = "static/image/buttons/arrow_down.gif";
    }
    else
    {
        elPanel.style.display = "block";
        elImage.src = "static/image/buttons/arrow_up.gif";
    }
}