document.observe('dom:loaded', function() {
  $$('a.article-window').invoke('observe','click',function(event){
      window.open(this.href,'pricing','width=950,height=500,left=150, top=220, scrollbars=1');
      event.stop();
    });
  $$('a.close-window').invoke('observe','click',function(event){
      window.close();
      event.stop();
    });
});