function $get(elem)
{
    return document.getElementById(elem);
}

function Show(pnl)
{
    _popup = new Popup($get(pnl));
    _popup.Open();

	if (window.attachEvent)
			window.attachEvent('onresize', OnWindowResize);
	else if (window.addEventListener)
			window.addEventListener('resize', OnWindowResize, false);
	else
			window.onresize = OnWindowResize;
		// we won't bother with using javascript in CSS to take care
	//   keeping the window centered
	if (document.all)
			document.documentElement.onscroll = OnWindowResize;
}

function Close()
{
    _popup.Close();
	if (window.detachEvent)
			window.detachEvent('onresize', OnWindowResize);
	else if (window.removeEventListener)
			window.removeEventListener('resize', OnWindowResize, false);
	else
			window.onresize = null;
}

function OnWindowResize()
{
    _popup.OnWindowResize();
}