function d(step) {
	var p = document.body.getElementsByTagName('p')[step];
	var h2 = document.body.getElementsByTagName('h2')[step];
	var h3 = document.body.getElementsByTagName('h3')[step];

	if (p.style.display != 'none') {
		p.style.display = 'none';
		h2.className = 'gray';
		h3.innerHTML = 'Show again';
		h3.className = 'have_no';
	} else {
		p.style.display = '';
		h2.className = step == 0 ? 'prep' : '';
		h3.innerHTML = 'I have it';
		h3.className = 'have_yes';
	}
}