var currentCol = 1;
var n = 0;
function next(fx){
	var nRows = $$('#inner div.noticia').length / 4;
	if(nRows > currentCol){
		fx.cancel();
		n = currentCol * 604;
		fx.start("margin-left", -n);
		currentCol ++;
	}
}
window.addEvent('domready', function(){
	var fx = new Fx.Tween($('inner'), {duration: 500, transition: Fx.Transitions.Sine.easeOut});
	$('next').addEvent('click', function(ev){ev = new Event(ev).stop(); next(fx);});
});