window.addEvent('domready', function(){
 	initForm();
});

function initForm() {
	if ($('form_1') && $('price')) {
		
		var priceEl = new Element('div', {
			'id': 'price',
			'html': '€'+$('price').value
		});
		
		priceEl.replaces($('price'));
		
		$('players').addEvent('change', function() {
			var price1 = Math.round($('players').value) * Math.round($('price_players').value);
			var price2 = Math.round($('non_playing').value) * Math.round($('price_nonplayers').value);
			var totalprice = price1 + price2;
			$('price').set('html', '€ '+totalprice);
		});
		$('non_playing').addEvent('change', function() {
			var price1 = Math.round($('players').value) * Math.round($('price_players').value);
			var price2 = Math.round($('non_playing').value) * Math.round($('price_nonplayers').value);
			var totalprice = price1 + price2;
			$('price').set('html', '€ '+totalprice);
		});
	}	
}