var popupWindow = null

function ShowPopup (url) 
{
    if (!popupWindow || popupWindow.closed) popupWindow = window.open (url,'popup','left=0,top=0,width=300,height=200,toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no')
	
    else 
    {
        popupWindow.focus ()
        popupWindow.location.href = url
    }
}