jQuery.autocomplete = function(input, options) {
	// Create a link to self
	var me = this;

	// Create jQuery object for input element
	var $input = $(input).attr("autocomplete", "off");

	// Apply inputClass if necessary
	if (options.inputClass) $input.addClass(options.inputClass);

	// Create results
	var results = document.createElement("div");
	// Create jQuery object for results
	var $results = $(results);
	$results.hide().addClass(options.resultsClass).css("position", "absolute");
	if( options.width > 0 ) $results.css("width", options.width);

	// Add to body element
	$("body").append(results);

	input.autocompleter = me;

	var lastEntry = null;

	var timeout = null;
	var prev = "";
	var active = -1;
	var cache = {};
	var keyb = false;
	var hasFocus = false;
	var lastKeyPressCode = null;

	// flush cache
	function flushCache(){
		cache = {};
		cache.data = {};
		cache.length = 0;
	};

	// flush cache
	flushCache();

	// if there is a data array supplied
	if( options.data != null ){
		var sFirstChar = "", stMatchSets = {}, row = [];

		// no url was specified, we need to adjust the cache length to make sure it fits the local data store
		if( typeof options.url != "string" ) options.cacheLength = 1;

		// loop through the array and create a lookup structure
		for( var i=0; i < options.data.length; i++ ){
			// if row is a string, make an array otherwise just reference the array
			row = ((typeof options.data[i] == "string") ? [options.data[i]] : options.data[i]);

			// if the length is zero, don't add to list
			if( row[0].length > 0 ){
				// get the first character
				sFirstChar = row[0].substring(0, 1).toLowerCase();
				// if no lookup array for this character exists, look it up now
				if( !stMatchSets[sFirstChar] ) stMatchSets[sFirstChar] = [];
				// if the match is a string
				stMatchSets[sFirstChar].push(row);
			}
		}

		// add the data items to the cache
		for( var k in stMatchSets ){
			// increase the cache size
			options.cacheLength++;
			// add to the cache
			addToCache(k, stMatchSets[k]);
		}
	}

	// only opera doesn't trigger keydown multiple times while pressed, others don't work with keypress at all
	$input.bind(($.browser.opera ? "keypress" : "keydown") + ".autocomplete", function(e) {
		// track last key pressed
		lastKeyPressCode = e.keyCode;
		switch(e.keyCode) {
			case 38: // up
				e.preventDefault();
				moveSelect(-1);
				break;
			case 40: // down
				e.preventDefault();
				moveSelect(1);
				break;
			case 9:  // tab
			case 13: // return
				if( selectCurrent() ) {
					e.preventDefault();
					return false;
				}
				break;
			default:
				active = -1;
				if (timeout) clearTimeout(timeout);
				timeout = setTimeout(function(){onChange();}, options.delay);
				break;
		}
	})
	.focus(function(){
		// track whether the field has focus, we shouldn't process any results if the field no longer has focus
		hasFocus = true;
	})
	.blur(function() {
		// track whether the field has focus
		hasFocus = false;
		hideResults();
	});

	hideResultsNow();

	function onChange() {

		// ignore if the following keys are pressed: [del] [shift] [capslock]
		lastEntry = null;
		var v = $input.val();
		if (lastKeyPressCode == 46 || (lastKeyPressCode > 8 && lastKeyPressCode < 32)) {
			if(lastKeyPressCode == 46 && typeof options.onChange === 'function' && ((v != prev) || (v==''))){
				options.onChange();
			}
			return $results.hide();
		}
		if (v == prev) {
			return;
		}
		prev = v;
		if (v.length >= options.minChars) {
			$input.addClass(options.loadingClass);
			requestData(v);
		} else {
			$input.removeClass(options.loadingClass);
			$results.hide();
		}

		if(typeof options.onChange === 'function'){
			options.onChange();
		}
	};

	function moveSelect(step,redirect) {

		var lis = $("li", results);
		if (!lis) return;

		active += step;

		if (active < 0) {
			active = 0;
		} else if (active >= lis.size()) {
			active = lis.size() - 1;
		}

		if($(lis[active]).hasClass('ac_separator')){
			if (!redirect) {
				moveSelect(step, true);
			}
			return;
		}


		lis.removeClass("ac_over");

		$(lis[active]).addClass("ac_over");

	};

	function selectCurrent() {
		var li = $("li.ac_over", results)[0];
		if (!li) {
			var $li = $("li", results);
			if (options.selectOnly) {
				if ($li.length == 1) li = $li[0];
			} else if (options.selectFirst) {
				li = $li[0];
			}
		}
		if (li) {
			selectItem(li);
			return true;
		} else {
			return false;
		}
	};

	function selectItem(li) {
		if (!li) {
			li = document.createElement("li");
			li.extra = [];
			li.selectValue = "";
		}
		li.related = $input;

		var v = $.trim(li.selectValue ? li.selectValue : li.innerHTML);
		input.lastSelected = v;
		prev = v;
		$results.html("");
		$input.val(v);
		hideResultsNow();
		if (options.onItemSelect) setTimeout(function() { options.onItemSelect(li) }, 1);
	};

	// selects a portion of the input string
	function createSelection(start, end){
		// get a reference to the input element
		var field = $input.get(0);
		if( field.createTextRange ){
			var selRange = field.createTextRange();
			selRange.collapse(true);
			selRange.moveStart("character", start);
			selRange.moveEnd("character", end);
			selRange.select();
		} else if( field.setSelectionRange ){
			field.setSelectionRange(start, end);
		} else {
			if( field.selectionStart ){
				field.selectionStart = start;
				field.selectionEnd = end;
			}
		}
		field.focus();
	};

	function createHiglight(elementText,userText){
		var start = String(elementText).toLowerCase().indexOf(userText.toLowerCase());
		var end = start + String(userText).length;

		var newText = [];
		if(start != -1){
			newText.push(elementText.substring(0,start));
			newText.push('<span class="ac_higlight">');
			newText.push(elementText.substring(start,end));
			newText.push('</span>');
			newText.push(elementText.substring(end,elementText.length));
		} else {
			newText.push(elementText);
		}

		return newText.join('');
	}

	// fills in the input box w/the first match (assumed to be the best match)
	function autoFill(sValue,One){
		// if the last user key pressed was backspace, don't autofill
		if( lastKeyPressCode != 8 && One === false ){
			// fill in the value (keep the case the user has typed)
			$input.val($input.val() + sValue.substring(prev.length));
			// select the portion of the value not typed by the user (so the next character will erase)
			createSelection(prev.length, sValue.length);
		}
		if( lastKeyPressCode != 8 && One !== false ){
			$input.val(sValue);
		}
		$input.blur();
	};

	function showResults() {
		// get the position of the input field right now (in case the DOM is shifted)
		var pos = $(input).offset();
		// either use the specified width, or autocalculate based on form element
		// var iWidth = (options.width > 0) ? options.width : $input.width();

		var test = parseInt(pos.left)+parseInt($results.width());
		var view = parseInt($("body").width());
		var acLeft = (view<test) ? pos.left - $results.width() +  $input.width() + 4: pos.left;

		$results.css({
			width: "auto",
			top: pos.top + input.offsetHeight + "px",
			left: acLeft + "px"
		}).show();
	};

	function hideResults() {
		if (timeout) clearTimeout(timeout);
		timeout = setTimeout(hideResultsNow, 200);
	};

	function hideResultsNow() {
		lastEntry = null;
		if (timeout) clearTimeout(timeout);
			$input.removeClass(options.loadingClass);
		if ($results.is(":visible")) {
			$results.hide();
		}
		if (options.mustMatch) {
			var v = $input.val();
			if (v != input.lastSelected) {
				selectItem(null);
			}
		}
	};

	function receiveData(q, data) {
		if (data) {
			$input.removeClass(options.loadingClass);
			results.innerHTML = "";


			// if the field no longer has focus or if there are no matches, do not display the drop down
			if( !hasFocus || data.length == 0 ) return hideResultsNow();
			//if( data.length == 0 ) return hideResultsNow();

			if ($.browser.msie) {
				// we put a styled iframe behind the calendar so HTML SELECT elements don't show through
				$results.append(document.createElement('iframe'));
			}
			var dom = dataToDom(data);
			var res = (options.formatResult) ? options.formatResult(data[0]) : data[0][options.element];			
		
			results.appendChild(dom);
		
			// autofill in the complete box w/the first match as long as the user hasn't entered in more data
			if (options.autoFill && ($input.val().toLowerCase() == q.toLowerCase())) {
				autoFill(res, false);
			}
			//if (options.autoFillOne == true && countData(data) == 1 && ($input.val().toLowerCase() == q.toLowerCase())) {
			if (options.autoFillOne == true && countData(data) == 1) { // && data[0].suggestion == 'f'
				var li = $('li:not(.ac_separator)',dom).get(0);
				if (options.onItemSelect) setTimeout(function() { options.onItemSelect(li) }, 1);

				autoFill(res, true);
			}
			if (options.autoFillOne == false || countData(data) > 1) {
				showResults();
			}
		} else {
			hideResultsNow();
		}
	};

	function countData(data){
		if(typeof data !== 'object') return 0;
		for(i in data); return ++i;
	}

	function parseData(data) {
		if (!data) return null;
		var parsed = [];
		return data;
	};

	function dataToDom(data) {
		var ul = document.createElement("ul");
		var num = data.length;

		// limited results to a max number
		if( (options.maxItemsToShow > 0) && (options.maxItemsToShow < num) ) num = options.maxItemsToShow;

		for (var i=0; i < num; i++) {
			var row = data[i];
			if (!row) {
				lastEntry == null;
				continue;
			}
			if(typeof row.type !== 'undefined'){
				if (row.type != lastEntry || i == 0) {
					$('<li class="ac_separator"><div>'+I18N_ACSeparator[row.type]+'</div></li>').appendTo(ul);
				}
				lastEntry = row.type;
			}
			var li = document.createElement("li");
			li.data = row;
			if (typeof options.formatItem == 'function') {
				if (typeof options.formatResult == 'function') {
					li.selectValue = options.formatResult(row);
				} else {
					li.selectValue = row[options.element];
				}
				row.elementhiglight = createHiglight(row[options.element], $input.val());
				li.innerHTML = options.formatItem(row, i, num);
			} else {
				li.innerHTML = row[options.element];
				if (typeof options.formatResult == 'function') {
					li.selectValue = options.formatResult(row);
				} else {
					li.selectValue = row[options.element];
				}
			}
			var extra = null;
			if (row.length > 1) {
				extra = [];
				for (var j=1; j < row.length; j++) {
					extra[extra.length] = row[j];
				}
			}
			li.extra = extra;
			ul.appendChild(li);
			$(li).hover(
				function() { $("li", ul).removeClass("ac_over"); $(this).addClass("ac_over"); active = $("li", ul).indexOf($(this).get(0)); },
				function() { $(this).removeClass("ac_over"); }
			).mousedown(function(e) { e.preventDefault(); e.stopPropagation(); selectItem(this) });
		}
		return ul;
	};

	function requestData(q) {
		if (!options.matchCase) q = q.toLowerCase();
		var data = options.cacheLength ? loadFromCache(q) : null;
		// recieve the cached data
		if (data) {
			receiveData(q, data);
		// if an AJAX url has been supplied, try loading the data now
		} else if( (typeof options.url == "string") && (options.url.length > 0) ){
			$.getJSON(makeUrl(q),function(data){
				data = parseData(data);
				addToCache(q, data);
				receiveData(q, data);
			});
		// if there's been no data found, remove the loading class
		} else {
			$input.removeClass(options.loadingClass);
		}
	};

	function makeUrl(q) {
		var _ = (String(options.url).substr(-1)=='/') ? '?q=' : '/?q=';
		var url = options.url + _ + encodeURI($.trim(q));
		for (var i in options.extraParams) {
			url += "&" + i + "=" + encodeURI(options.extraParams[i]);
		}
		return url;
	};

	function loadFromCache(q) {
		if (!q) {
			return null;
		}
		if (cache.data[q]) {
			return cache.data[q];
		}
		return null;
	};

	function matchSubset(s, sub) {
		if (!options.matchCase) s = s.toLowerCase();
		var i = s.indexOf(sub);
		if (i == -1) return false;
		return i == 0 || options.matchContains;
	};

	this.flushCache = function() {
		flushCache();
	};

	this.setExtraParams = function(p) {
		options.extraParams = p;
	};

	this.findValue = function(){
		var q = $input.val();

		if (!options.matchCase) q = q.toLowerCase();
		var data = options.cacheLength ? loadFromCache(q) : null;
		if (data) {
			findValueCallback(q, data);
		} else if( (typeof options.url == "string") && (options.url.length > 0) ){
			$.getJSON(makeUrl(q),function(data){
				data = parseData(data);
				addToCache(q, data);
				findValueCallback(q, data);
			});
		} else {
			// no matches
			findValueCallback(q, null);
		}
	};

	function findValueCallback(q, data){
		if (data) $input.removeClass(options.loadingClass);
		//if (data) $('#ac_loading').remove();
		var num = (data) ? data.length : 0;
		var li = null;

		for (var i=0; i < num; i++) {
			var row = data[i];
			if( row[options.element].toLowerCase() == q.toLowerCase() ){
				li = document.createElement("li");

				if (options.formatItem) {
					li.innerHTML = options.formatItem(row, i, num);
					li.selectValue = row[options.element];
				} else {
					li.innerHTML = row[options.element];
					li.selectValue = row[options.element];
				}
				var extra = null;
				if( row.length > 1 ){
					extra = [];
					for (var j=1; j < row.length; j++) {
						extra[extra.length] = row[j];
					}
				}
				li.extra = extra;
			}
		}

		if( options.onFindValue ) setTimeout(function() { options.onFindValue(li) }, 1);
	};

	function addToCache(q, data) {
		if (!data || !q || !options.cacheLength) return;
		if (!cache.length || cache.length > options.cacheLength) {
			flushCache();
			cache.length++;
		} else if (!cache[q]) {
			cache.length++;
		}
		cache.data[q] = data;
	};
};

jQuery.fn.autocomplete = function(url, options, data) {
	// Make sure options exists
	options = options || {};
	// Set url as option
	options.url = url;
	// set some bulk local data
	options.data = ((typeof data == "object") && (data.constructor == Array)) ? data : null;

	// Set default values for required options
	options.inputClass = options.inputClass || "ac_input";
	options.resultsClass = options.resultsClass || "ac_results";
	options.lineSeparator = options.lineSeparator || "\n";
	options.cellSeparator = options.cellSeparator || "|";
	options.minChars = options.minChars || 1;
	options.delay = options.delay || 400;
	options.matchCase = options.matchCase || 0;
	options.matchSubset = options.matchSubset || 1;
	options.matchContains = options.matchContains || 0;
	options.cacheLength = options.cacheLength || 1;
	options.mustMatch = options.mustMatch || 0;
	options.extraParams = options.extraParams || {};
	options.loadingClass = options.loadingClass || "ac_loading";
	options.selectFirst = options.selectFirst || false;
	options.selectOnly = options.selectOnly || false;
	options.maxItemsToShow = options.maxItemsToShow || -1;
	options.autoFill = options.autoFill || false;
	options.autoFillOne = options.autoFillOne || false;
	options.onChange = options.onChange || false;
	options.width = parseInt(options.width, 10) || 0;
	options.element = options.element || 'elementname';

	this.each(function() {
		var input = this;
		new jQuery.autocomplete(input, options);
	});

	// Don't break the chain
	return this;
};

jQuery.fn.autocompleteArray = function(data, options) {
	return this.autocomplete(null, options, data);
};

jQuery.fn.indexOf = function(e){
	for( var i=0; i<this.length; i++ ){
		if( this[i] == e ) return i;
	}
	return -1;
};