function fetchData( $elements ) {

	var data = {};

	$elements.each(function() {
		var $this = $(this),
			name = $this.attr('name'),
			value = $this.val();

		if ( name.substr(-2, 2) === '[]' ) {
			if ( ! data[ name ] ) {
				data[ name ] = [ value ];
			} else {
				data[ name ].push( value );
			}
		} else {
			data[ name ] = value;
		}

	});

	return data;
}

function send(url) {
	$('textarea[name=\'message\']').html($('textarea[name=\'message\']').val());

	var data = fetchData($('#mail select, #mail input, #mail textarea'));

	$.ajax({
		url: url,
		type: 'post',
		data: data,
		// ......
	});
}