function showTestimonial(index){
	var allChildren = document.getElementById('testimonials').getElementsByTagName('div');
	allChildren[index].style.display = 'block';
}
function changeTestimonial(){
	var testimonialsCount = document.getElementById('testimonials').getElementsByTagName('div').length;
	var randomIndex = Math.floor(Math.random()*(testimonialsCount));
	showTestimonial(randomIndex);
}