(function($){
	$.fn.selectchain = function(options){
		var defaults = {
			url: '',
			prepend: {'':'All'},
			append: {},
			target: '',
			targets: [],
			selected: null,
			data: (this[0])?{selectchain:this[0].id}:{},
			sources: [],
			onReload: function(){}
		};

		var settings = $.extend({}, defaults, options);
		if (settings.target) if (!(settings.target instanceof $)) settings.target = $(settings.target);
		if (!settings.targets.length)
		{
			if (settings.target)
				settings.targets.push(settings.target);
		}
		for (i = 0; i < settings.targets.length;i++)
		{
			if (!(settings.targets[i] instanceof $)) settings.targets[i] = $(settings.targets[i]);
			if (settings.targets[i] == $(this)) settings.targets.splice(i,1);
		}
		for (i = 0; i < settings.sources.length;i++)
		{
			if (settings.sources[i]) if (!(settings.sources[i] instanceof $)) settings.sources[i] = $(settings.sources[i]);
		}
		
		var selectChain = $.data(this[0], 'selectChain');
		if (selectChain)
		{
			return selectChain;
		}
		
		selectChain = new $.selectChain(settings,this[0]);
		//_selectChain = ;
		if (settings.targets.length)
		{
			$(this).change(function(){
				for (i in settings.targets)
				{
					if ($(this).data('notChange'))
					//if (selectChain.notChange)
					{
						settings.targets[i].selectchain().setSelected();
					}
					$(this).data('notChange',false);
					//selectChain.notChange = false;
					settings.targets[i].selectchain().reload();
				}
			});
		}
		$.data(this[0], 'selectChain', selectChain); 
		return selectChain;
	};
	$.selectChain = function(options, select)
	{
		this.options = options;
		this.select = select;
		this.setSelected = function(sel)
		{
			if (sel)
			{
				this.options.selected = sel;
			}
			else
			{
				this.options.selected = $(this.select).val();
				this.notChange = true;
			}
			return this;
		}
		this.reload = function(){
			var url = this.options.url;
			var obj = $(this.select);
			var options = this.options;
			var selected = options.selected;
			var sources = {};
			for (var i = 0; i < this.options.sources.length;i++)
			{
				if (this.options.sources[i])
				{
					id = this.options.sources[i].attr('id');
					val = this.options.sources[i].val();
					sources[id] = val;
				}
			}
			var data = $.extend(this.options.data,sources);
			obj.empty();
			obj.attr('disabled','disabled');
			obj.append('<option>Loading...</option>');
			
			$.ajax({
				url: url,
				data: data,
				type: 'POST',
				dataType: 'json',
				success: function (resp) {
					obj.empty();
					obj.removeAttr('disabled');
					for (i in options.prepend)
					{
						obj.prepend("<option value='"+i+"'>"+options.prepend[i]+"</option>");
					}
					var j = __toArray(resp); 
                                        var html = '';
					for (i in j) {  
						//var o = $("<option value='"+j[i][0]+"'>"+j[i][1]+"</option>");
						var o = "<option value='"+j[i][0]+"'";
                                                if (options.selected !== null)
							if (options.selected == j[i][0])
							{
								//o.attr('selected', 'selected');
                                                                o += " selected='selected' ";
								options.selected = null;
							}
						//obj.append(o);
                                                 o += ">"+j[i][1]+"</option>"
                                                 html += o;
					}
                                        
					obj.append(html);
					for (i in options.append)
					{
						obj.append("<option value='"+i+"'>"+options.append[i]+"</option>");
					}
					if (options.onReload) options.onReload(j);
					// hand control back to browser for a moment
					setTimeout(function () {
						obj.trigger('change');
					}, 0);
				},
				error: function (xhr, desc, er) {
					//alert("an error occurred");
				}
			});
		};
		return this;
	};
})(jQuery);

function __toArray( obj ) {
  var arr = [];
  for (var i in obj){ 
    arr[i] = [i,obj[i]];
  } 
  return arr.sort(function(a,b){
      var a1 = (""+a[1]).toLowerCase();
      var b1 = (""+b[1]).toLowerCase();
      
      if(a1 > b1) return 1;
      if(a1 < b1) return -1;
      return 0;
  });
}