function Tre_Opn(obj, spnnam)
{
    if(document.getElementById)
    {
        var el = document.getElementById(obj);
        var ar = document.getElementById("masterdiv").getElementsByTagName("span"); 
        for (var i=0; i<ar.length; i++)
        {
            if (ar[i].className==spnnam) ar[i].style.display = "none";
        }
        el.style.display = "block";
    }
}


function Tre_Opn0(obj, spnnam)
{
    if(document.getElementById)
    {
        var el = document.getElementById(obj);
        var ar = document.getElementById("masterdiv").getElementsByTagName("span"); 
        if(el.style.display != "block")
        {
            for (var i=0; i<ar.length; i++)
            {
                if (ar[i].className==spnnam) ar[i].style.display = "none";
            }
            el.style.display = "block";
        }
        else
        {
            el.style.display = "none";
        }
    }
}