function price(currency) {
	document.getElementById('gbp').className = '';
	document.getElementById('usd').className = '';
	document.getElementById('eur').className = '';
	document.getElementById(currency).className = 'sel';
	
	cell = document.getElementById("td-price-stud");
	if (cell != null) {
		if (currency == 'gbp') cell.innerHTML = "£10";
		if (currency == 'usd') cell.innerHTML = "$16";
		if (currency == 'eur') cell.innerHTML = "€12";
	}
	
	cell = document.getElementById("td-price-prem");
	if (cell != null) {
		if (currency == 'gbp') cell.innerHTML = "£10";
		if (currency == 'usd') cell.innerHTML = "$16";
		if (currency == 'eur') cell.innerHTML = "€12";
	}
	
	cell = document.getElementById("td-price-tchr");
	if (cell != null) {
		if (currency == 'gbp') cell.innerHTML = "£50";
		if (currency == 'usd') cell.innerHTML = "$82";
		if (currency == 'eur') cell.innerHTML = "€58";
	}
}