function hideMain() {
	document.getElementById('headline').style.display = 'none';
	document.getElementById('himg').style.display = 'none';
}

function checkField(field) {
	if(document.forms['BF'][field].value) return true;
}

function checkBookForm() {
	var msg = '';

	if(!checkField('book[name]')) msg += '\nFirst name';
	if(!checkField('book[surname]')) msg += '\nLast name';
	if(!checkField('book[street]')) msg += '\nStreet';
	if(!checkField('book[city]')) msg += '\nCity';
	if(!checkField('book[country]')) msg += '\nCountry';
	if(!checkField('book[phone]')) msg += '\nPhone';
	if(!checkField('book[email]')) msg += '\nE-mail';
	if(!checkField('book[cc1]') || !checkField('book[cc2]') || !checkField('book[cc3]') || !checkField('book[cc4]')) msg += '\nCredit card number';
	if(!checkField('book[cc_cvc]')) msg += '\nCVC number';

	if(msg != '') {
		alert('Please fill out this field(s):\n' + msg);
		return false;
	}
}

function person(id) {
	var room = document.getElementById('room'+id);
	var value = (room.options[room.selectedIndex].value);
	if(value>0) {
		document.getElementById('person'+id).style.display = 'block';
	} else {
		document.getElementById('person'+id).style.display = 'none';
	}
}