(function ($) {
	$.fn.selectChain = function (options) {
		var defaults = {
			key: "id",
			value: "label",
			issel: "selected"
		};

		var settings = $.extend({}, defaults, options);

		if (!(settings.target instanceof $)) settings.target = $(settings.target);

		return this.each(function () {
			var $$ = $(this);

			$$.change(function () {
				var data = null;
				if (typeof settings.data == 'string') {
					data = settings.data + '&' + this.name + '=' + $$.val();
				} else if (typeof settings.data == 'object') {
					data = settings.data;
					data[this.name] = $$.val();
				}
				if (this.id=='sections')
				{
					data=data+"&papers="+$('#papers').val();
				}

				settings.target.empty();

				$.ajax({
					url: settings.url,
					   data: data,
					   type: (settings.type || 'get'),
					   dataType: 'json',
					   success: function (j) {
						   var options = [], i = 0, o = null;

						   for (i = 0; i < j.length; i++) {
							   // required to get around IE bug (http://support.microsoft.com/?scid=kb%3Ben-us%3B276228)
							   o = document.createElement("OPTION");
							   o.value = typeof j[i] == 'object' ? j[i][settings.key] : j[i];
							   o.text = typeof j[i] == 'object' ? j[i][settings.value] : j[i];

							  // o.selected = typeof j[i] == 'object' ? j[i][settings.issel] : false;
							   //alert(j[i][settings.issel]);
							   settings.target.get(0).options[i] = o;
							   if(typeof j[i] == 'object')
							   {
								   if(j[i][settings.issel] == true)
								   {
									   settings.target.get(0).options.selectedIndex = i;
								   }
							   }

						   }

						   // hand control back to browser for a moment
						   setTimeout(function () {
							   settings.target
							   .find('option:first')
							   .attr('selected', 'selected')
							   .parent('select')
							   .trigger('change');
						   }, 0);
					   },
									   error: function (xhr, desc, er) {
										   // add whatever debug you want here.
										   //alert("an error occurred");
									   }
				});
			});
		});
	};
})(jQuery);