function PopUp(url, width, height, title)
                {
                var TopLeftX=screen.width / 2 - width/2;
                var TopLeftY=screen.height / 2 - height/2;
                window.open(url,title,'top='+TopLeftY+', left='+TopLeftX+', width='+width+',height='+height+',directories=no,location=no,menubar=no,scrollbars=no,status=no,toolbar=no,resizable=no');
                }