function showHideDiv(name, prop) 
{
    if (document.layers)
    {
        document.layers[name].show = prop;
    }
    else if (document.getElementById)
    {
        document.getElementById(name).style.visibility = prop;
    }
}
function block(area)
{
    var imgExpand = "/images/common/window_open.gif";
    var imgClose = "/images/common/window_close.gif";

    if (document.layers)
    {
        current = (document.layers[area].display == 'none') ? 'block' : 'none';
        //document.layers[icon].src = (current == 'none') ? imgExpand : imgClose;
        document.layers[area].display = current;
    }
    else if (document.getElementById)
    {
        vista = (document.getElementById(area).style.display == 'none') ? 'block' : 'none';
        //document.getElementById(icon).src = (vista == 'none') ? imgExpand : imgClose; 
        document.getElementById(area).style.display = vista;
    }   // end if (document.layers)

}   // end function block

/* on = "true" to block
   on = "false" to none */
function blockDiv(area, icon, on)
{
    var imgExpand = "/images/common/window_open.gif";
    var imgClose = "/images/common/window_close.gif";
    
    if (document.layers)
    {
        if(document.layers[icon]!=null && document.layers[area]!=null )
        {
            document.layers[icon].src = on ? imgExpand : imgClose;
            document.layers[area].display = on ? 'block' : 'none';
        }
    }
    else if (document.getElementById)
    {
        if(document.getElementById(icon)!=null && document.getElementById(area)!=null)
        {
            document.getElementById(icon).src = on=="true" ? imgExpand : imgClose; 
            document.getElementById(area).style.display = on=="true" ? 'block' : 'none';
        }
    }
}