I have the following Javascript code

add_num = {
  f: function(html, num) {
    alert(this.page);
  },

  page : function() {
    return parseInt(this.gup('page'));
  },

  gup : function(name) {
    name = name.replace(/[\[]/,'\\\[').replace(/[\]]/,'\\\]');
    var regex = new RegExp('[\\?&]'+name+'=([^&#]*)');
    var results = regex.exec(window.location.href);
    if(results == null)
      return '';
    else
      return results[1];
  }
}

But when I call add_num.f() what I get from alert() is the actual code of page. That is, it returns

function() {
    return parseInt(this.gup('page'));
  }

I was expecting a numeric value and not any code at all.