function add_to_cart(product_id)
{
	pars = 'cmd=add';
	pars += '&product_id=' + product_id;
	pars += '&quantity=' + $F('quantity_' + product_id);
	for (i = 0; i < $F('options_count_' + product_id); i++) {
		pars += '&option_' + i + '=' + $F('option_' + product_id + '_' + i);
		pars += '&value_' + i + '=' + $F('value_' + product_id + '_' + i);
	}
	pars += '&options_count=' + $F('options_count_' + product_id);
	
	var myAjax = new Ajax.Request(
			'control/shopping_cart.php',
			{
				method: 'get',
				parameters: pars,
				onComplete: showResponse
			}
		);

	function showResponse(originalRequest)
	{
		document.location.href = '/shopping_cart/'
	}

	return false;
}