var popupWindow = null

function ShowPopup (url) 
{
    if (!popupWindow || popupWindow.closed) popupWindow = window.open (url,'popup','left=10,top=20,width=400,height=600,toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes')
	
    else 
    {
        popupWindow.focus ()
        popupWindow.location.href = url
    }
}