(function ($) {
    $.fn.selectChain = function (options) {
        var defaults = {
            key: "id",
            value: "label"
        };
        
        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();
                }
                
                settings.target.empty();
                //alert(settings.url +settings.sel +  ' / ' + data[this.name] + ' / ' + settings.type);
                $.ajax({
                    url: settings.url,
                    data: data,
                    type: (settings.type || 'get'),
                    dataType: 'json',
                    success: function (j) {
                        var options = [], i = 0, o = null;
                        
						o = document.createElement("OPTION");
                        o.value = '0';
                        o.text = settings.ctit;
                        settings.target.get(0).options[0] = o;
						
                        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];
                            settings.target.get(0).options[i+1] = o;
                        }

				// hand control back to browser for a moment
				setTimeout(function () {
					settings.target
					  .find('option:[value="'+settings.sel+'"]')
					  .attr('selected', 'selected')
					  .parent('select')
					  .trigger('change');
				}, 0);
            },
            error: function (xhr, desc, er) {
           // add whatever debug you want here.
				//alert("an error occurred" + ' / ' + xhr + ' / ' + desc + ' / ' + er);
				alert("An error occurred, please try again!");
            }
                });
            });
        });
    };
})(jQuery);
//selection function
    $(function () {				
        var cat = $('#countries');
        var el = $('#cities');
		var selval = $('#sel_cit');
		var citTit = $('#citTit');
       
	   //alert(1);
        // to allow the chaining change trigger to work
        cat.selectChain({
            target: el,
            url: 'index.php',
			sel: selval.val(),
			ctit: citTit.val(),
            data: { ajax: true }
        }).trigger('change');

    });