function newWindow(url,width,height)
{
  var left=((window.screen.width)/2)-(width/2);
  var top=((window.screen.height)/2)-(height/2);
  w = window.open(url, '1', 'width='+width+',height='+height+',left='+left+',top='+top+',resizable=no,scrollbars=no,menubar=no,status=no');  
}