//check if the crippled window exists
var crip = null;
function NewPopupWindow(url)
{
	if((crip == null) || (crip.closed)) 
	{
		crip = window.open(url, 'popupwindow', 'toolbar=yes,menubar=no,scrollbars=yes,width=640,height=480,resizable=yes');
		crip.focus();
	}
	else
	{
		crip.navigate(url);
		crip.focus();
	}
}
function CloseOldWindow()
{
	if(crip != null) 
	{
		crip.close();
	}
}