function toggleLayer(obj, whichLayer)
{    
    if (document.getElementById)
    {
        // this is the way the standards work
        var style2 = document.getElementById(whichLayer).style;

        //style2.display = style2.display? "":"block";
    }
    else if (document.all)
    {
        // this is the way old msie versions work
        var style2 = document.all[whichLayer].style;
    }
    else if (document.layers)
    {
        // this is the way nn4 works
        var style2 = document.layers[whichLayer].style;
    }
    else
    {
		return;
    }
    
	if ( style2.display=="none" )
	{
		style2.display = "block";
	}
	else if ( style2.display=="block" )
	{
		style2.display = "none";
	}

}