self.addEvent('domready', function(){
    
    local = (String)(self.location);
    
    if($('por_que_nos') != null){
    
        porQueNos = $('por_que_nos');
        scrollPQN = new Fx.Scroll(porQueNos);
        boxNoticia = $$('.moduletablenoticias_inicial tbody tr td');
     
        tables = $('por_que_nos').getElements('table');
        tbodys = tables[0].getElements('tbody');
        trs = tbodys[0].getElements('tr');
        tds = trs[0].getElements('td');
        
        noticias = new Array();
        
        for(q = 0;q <= 15;q = q + 3){
            
            noticias.push(tds[q]);
            
        }
        
        $('bt_anterior').addEvent('click', function(){
        
            scrollPQN.start(0,0);
            $('bt_anterior').setStyle('background-position','-60px center');
            $('bt_proximo').setStyle('background-position','-150px center');
        
        });
        
        $('bt_proximo').addEvent('click', function(){
        
            scrollPQN.start(840,0);
            $('bt_anterior').setStyle('background-position','0 center');
            $('bt_proximo').setStyle('background-position','-90px center');
        
        });
        
     }

});