function opensms() 
{ 
  var winWidth=600;
  var winHeight=600;
  var topPos=(screen.height-winHeight)/2; 
  var leftPos=(screen.width-winWidth)/2; 
  var settings='toolbar=no,top='+topPos+',left='+leftPos+',width='+winWidth+',height='+winHeight+',status=yes,scrollbars=yes,resize=no,menubar=no';
  window.open('/sms/sms.asp','metaxsms',settings);
}