function enlaceMan(enlace)
 {
  var screenW = 690; //screen.width-80;
  var screenH = 500; //screen.height-60;
  var Xpos=(screen.width-80/2)-screenW-80/2; 
  var Ypos=(screen.height-60/2)-screenH-60/2; 
  window.open(enlace,"manual","tolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=1,height="+screenH+",width="+screenW+",left = "+Xpos+",top = "+Ypos+""); 
  var ventana = window.self;
  ventana.opener = window.self;
}