function swapImage_over(val)
    {
        document.getElementById(val).src = "}Images/plus_o.gif";
    }
    
    function swapImage_out(val)
    {
        document.getElementById(val).src = "}Images/plus.gif";
    }
 
    function swapArrow_over(val)
    {
        document.getElementById(val).src = "}Images/downarrow_o.gif";
    }
    
    function swapArrow_out(val)
    {
        document.getElementById(val).src = "}Images/downarrow.gif";
    }
 
 
 
    function ShowSubNavPNG()
    {
        var agt=navigator.userAgent.toLowerCase();
        var is_mac = (agt.indexOf("mac")!=-1);
        var MidX=screen.availWidth/2;

        if(is_mac)
        {
            if(agt.indexOf("mozilla/5.0") != -1)
            {
                document.getElementById('divSubNav').style.backgroundImage = "url('}Images/Subnav/subnavbg.png')";
            }
            else
            {
                document.getElementById('divSubNav').style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader (src='}Images/Subnav/subnavbg.png')";
            }
        }
        else
        {
            if(agt.indexOf("mozilla/5.0") != -1)
            {
                document.getElementById('divSubNav').style.backgroundImage = "url('}Images/Subnav/subnavbg.png')"; 
            } 
            else
            {
                document.getElementById('divSubNav').style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader (src='}Images/Subnav/subnavbg.png')";
            }
        }           
    }