$(function() {

    if($('#main_teasers').children().length > 0){

        $('#main_teasers').nivoSlider({
		effect: 'fade',
                pauseTime: 4000,
                directionNav: false,
		controlNav: false,
		keyboardNav: false,
                manualAdvance: true,
                startSlide: slider_start_id
	});

    }

});