(function($) {
	var name_space = 'autokana';
	$.fn[name_space] = function(options) {

		var elements = this;
		var settings = $.extend({
			'suffix' : '_kana',
			'target' : false
		}, options);

		var check_value = function () {
			var val = $(this).val();
			var rmf = $.data(this, name_space);
			var hit = [];
			$.each(val.split('').reverse(), function () {
				var c = this.charCodeAt();
				//hiragana?
				if (c < 0x3041 || c > 0x3096) return false;
				hit.push(this);
			});
			if (!hit.length) return;
			rmf.old = hit.reverse().join('');
		};

		var set_value = function () {
			var rmf = $.data(this, name_space);
			if (!rmf.old) return;
			var target = settings.suffix
				? $('[name="'+this.name+settings.suffix+'"]')
				: $(settings.target)
			;
			var kana = $(target);
			kana.val(kana.val() + rmf.old);
			rmf.old = '';
		};

		elements.each(function() {
			var key_func = function (env) {
				check_value.call(this);
				if (env.keyCode != 13) return;
				set_value.call(this);
			};
			( function (v) {
				return ([$.data(v.get(0), name_space, {}), v])[1];
			} )( $(this) )
				.keyup(key_func)
				.keydown(key_func)
				.keypress(check_value)
				.bind('text', check_value)
			;

		});
		return this;
	};
})(jQuery);