var training = new Training();

function Training() {

  var base = 'http://download.mawebcenters.com/Training/';

  this.open = function(page) {
    var left = screen.availWidth  / 2 - 512;
    var top  = screen.availHeight / 2 - 384;
    window.open(page,'TrainingVideo','width=880,height=650,left=' + left + ',top=' + top);
    return(false);
  }
}