function toggle(whichLayer)
{
    var l=document.getElementsByTagName("div");
    for (var i=0; i<l.length; i++){
        l[i].style.display="";
    }
    if (document.getElementById)
    {
        var style2 = document.getElementById(whichLayer).style;
        style2.display = style2.display? "":"block";
    }
    else if (document.all)
    {
        var style2 = document.all[whichLayer].style;
        style2.display = style2.display? "":"block";
    }
    else if (document.layers)
    {
        var style2 = document.layers[whichLayer].style;
        style2.display = style2.display? "":"block";
    }
}