;(function($) {
 
$.fn.addOption = function()
{
	var add = function(el, v, t, sO)
	{
		var option = document.createElement("option");
		option.value = v, option.text = t;
		// get options
		var o = el.options;
		// get number of options
		var oL = o.length;
		if(!el.cache)
		{
			el.cache = {};
			// loop through existing options, adding to cache
			for(var i = 0; i < oL; i++)
			{
				el.cache[o[i].value] = i;
			}
		}
		// add to cache if it isn't already
		if(typeof el.cache[v] == "undefined") el.cache[v] = oL;
		el.options[el.cache[v]] = option;
		if(sO)
		{
			option.selected = true;
		}
	};
	
	var a = arguments;
	if(a.length == 0) return this;
	// select option when added? default is true
	var sO = true;
	// multiple items
	var m = false;
	// other variables
	var items, v, t;
	if(typeof(a[0]) == "object")
	{
		m = true;
		items = a[0];
	}
	
	if(a.length >= 2)
	{
		if(typeof(a[1]) == "boolean") sO = a[1];
		else if(typeof(a[2]) == "boolean") sO = a[2];
		if(!m)
		{
			v = a[0];
			t = a[1];
		}
	}
	
	this.each(
		function()
		{
			if(this.nodeName.toLowerCase() != "select") return;
			if(m)
			{
				for(var item in items)
				{
					add(this, item, items[item], sO);
				}
			}
			else
			{
				add(this, v, t, sO);
			}
		}
	);
	return this;
};

$.fn.ajaxAddOption = function(url, params, select, fn, args)
{
	if(typeof(url) != "string") return this;
	if(typeof(params) != "object") params = {};
	if(typeof(select) != "boolean") select = true;
	this.each(
		function()
		{
			var el = this;
			$.getJSON(url,
				params,
				function(r)
				{
					$(el).addOption(r, select);
					if(typeof fn == "function")
					{
						if(typeof args == "object")
						{
							fn.apply(el, args);
						} 
						else
						{
							fn.call(el);
						}
					}
				}
			);
		}
	);
	return this;
};

$.fn.removeOption = function()
{
	var a = arguments;
	if(a.length == 0) return this;
	var ta = typeof(a[0]);
	var v, index;
	// has to be a string or regular expression (object in IE, function in Firefox)
	if(ta == "string" || ta == "object" || ta == "function" )
	{
		v = a[0];
		// if an array, remove items
		if(v.constructor == Array)
		{
			var l = v.length;
			for(var i = 0; i<l; i++)
			{
				this.removeOption(v[i], a[1]); 
			}
			return this;
		}
	}
	else if(ta == "number") index = a[0];
	else return this;
	this.each(
		function()
		{
			if(this.nodeName.toLowerCase() != "select") return;
			// clear cache
			if(this.cache) this.cache = null;
			// does the option need to be removed?
			var remove = false;
			// get options
			var o = this.options;
			if(!!v)
			{
				// get number of options
				var oL = o.length;
				for(var i=oL-1; i>=0; i--)
				{
					if(v.constructor == RegExp)
					{
						if(o[i].value.match(v))
						{
							remove = true;
						}
					}
					else if(o[i].value == v)
					{
						remove = true;
					}
					// if the option is only to be removed if selected
					if(remove && a[1] === true) remove = o[i].selected;
					if(remove)
					{
						o[i] = null;
					}
					remove = false;
				}
			}
			else
			{
				// only remove if selected?
				if(a[1] === true)
				{
					remove = o[index].selected;
				}
				else
				{
					remove = true;
				}
				if(remove)
				{
					this.remove(index);
				}
			}
		}
	);
	return this;
};

$.fn.sortOptions = function(ascending)
{
	// get selected values first
	var sel = $(this).selectedValues();
	var a = typeof(ascending) == "undefined" ? true : !!ascending;
	this.each(
		function()
		{
			if(this.nodeName.toLowerCase() != "select") return;
			// get options
			var o = this.options;
			// get number of options
			var oL = o.length;
			// create an array for sorting
			var sA = [];
			// loop through options, adding to sort array
			for(var i = 0; i<oL; i++)
			{
				sA[i] = {
					v: o[i].value,
					t: o[i].text
				}
			}
			// sort items in array
			sA.sort(
				function(o1, o2)
				{
					// option text is made lowercase for case insensitive sorting
					o1t = o1.t.toLowerCase(), o2t = o2.t.toLowerCase();
					// if options are the same, no sorting is needed
					if(o1t == o2t) return 0;
					if(a)
					{
						return o1t < o2t ? -1 : 1;
					}
					else
					{
						return o1t > o2t ? -1 : 1;
					}
				}
			);
			// change the options to match the sort array
			for(var i = 0; i<oL; i++)
			{
				o[i].text = sA[i].t;
				o[i].value = sA[i].v;
			}
		}
	).selectOptions(sel, true); // select values, clearing existing ones
	return this;
};


$.fn.selectOptions = function(value, clear)
{
	var v = value;
	var vT = typeof(value);
	// handle arrays
	if(vT == "object" && v.constructor == Array)
	{
		var $this = this;
		$.each(v, function()
			{
      				$this.selectOptions(this, clear);
    			}
		);
	};
	var c = clear || false;
	// has to be a string or regular expression (object in IE, function in Firefox)
	if(vT != "string" && vT != "function" && vT != "object") return this;
	this.each(
		function()
		{
			if(this.nodeName.toLowerCase() != "select") return this;
			// get options
			var o = this.options;
			// get number of options
			var oL = o.length;
			for(var i = 0; i<oL; i++)
			{
				if(v.constructor == RegExp)
				{
					if(o[i].value.match(v))
					{
						o[i].selected = true;
					}
					else if(c)
					{
						o[i].selected = false;
					}
				}
				else
				{
					if(o[i].value == v)
					{
						o[i].selected = true;
					}
					else if(c)
					{
						o[i].selected = false;
					}
				}
			}
		}
	);
	return this;
};

$.fn.clearSelectedOptions = function()
{
	this.each(
		function()
		{
			this.selectedIndex=-1;
			this.selected=false;
		}
	);
	return this;
};

$.fn.copyOptions = function(to, which)
{
	var w = which || "selected";
	if($(to).size() == 0) return this;
	this.each(
		function()
		{
			if(this.nodeName.toLowerCase() != "select") return this;
			// get options
			var o = this.options;
			// get number of options
			var oL = o.length;
			for(var i = 0; i<oL; i++)
			{
				if(w == "all" || (w == "selected" && o[i].selected))
				{
					$(to).addOption(o[i].value, o[i].text);
				}
			}
		}
	);
	return this;
};


$.fn.moveOptions = function(to, which)
{
	var w = which || "selected";
	if($(to).size() == 0) return this;
	this.each(
		function()
		{
			
			if(this.nodeName.toLowerCase() != "select") return this;
			// get options
			var o = this.options;
			// get number of options
			var oL = o.length;
			var options_array=new Array();
			for(var i = 0; i<oL; i++)
			{
				if(w == "all" || (w == "selected" && o[i].selected))
				{
					$(to).addOption(o[i].value, o[i].text,false);
					//$(this).removeOption(o[i].value);
					options_array[i]=o[i].value;
					//since we removed the value we have to reset the length
					//oL = o.length;
				}
			}
			
			for(var j in options_array)
			{
				$(this).removeOption(options_array[j]);
			}
		}
	);
	return this;
};


$.fn.containsOption = function(value, fn)
{
	var found = false;
	var v = value;
	var vT = typeof(v);
	var fT = typeof(fn);
	// has to be a string or regular expression (object in IE, function in Firefox)
	if(vT != "string" && vT != "function" && vT != "object") return fT == "function" ? this: found;
	this.each(
		function()
		{
			if(this.nodeName.toLowerCase() != "select") return this;
			// option already found
			if(found && fT != "function") return false;
			// get options
			var o = this.options;
			// get number of options
			var oL = o.length;
			for(var i = 0; i<oL; i++)
			{
				if(v.constructor == RegExp)
				{
					if (o[i].value.match(v))
					{
						found = true;
						if(fT == "function") fn.call(o[i], i);
					}
				}
				else
				{
					if (o[i].value == v)
					{
						found = true;
						if(fT == "function") fn.call(o[i], i);
					}
				}
			}
		}
	);
	return fT == "function" ? this : found;
};

$.fn.selectedValues = function()
{
	var v = [];
	this.selectedOptions().each(
		function()
		{
			v[v.length] = this.value;
		}
	);
	return v;
};

$.fn.selectedTexts = function()
{
	var t = [];
	this.selectedOptions().each(
		function()
		{
			t[t.length] = this.text;
		}
	);
	return t;
};

$.fn.selectedOptions = function()
{
	return this.find("option:selected");
};

$.fn.getOptions = function()
{
	return this.find("option");
};

$.fn.countOptions = function()
{
	var count=0;
	this.getOptions().each(
		function()
		{
			count++;
		}
	);
	return count;
};

})(jQuery);