__AC = new Array();

    isIE = document.all ? true : false;
    isGecko = navigator.userAgent.toLowerCase().indexOf('gecko') != -1;
    isOpera = navigator.userAgent.toLowerCase().indexOf('opera') != -1;


    function ACCreate (id, data)
    {
        __AC[id] = {'data':data,
                              'isVisible':false,
                              'element':document.getElementById(id),
                              'dropdown':null,
                              'highlighted':null};

        __AC[id]['element'].setAttribute('autocomplete', 'off');
        __AC[id]['element'].onkeydown  = function(e) {return ACKeyDown(this.getAttribute('id'), e);}
        __AC[id]['element'].onkeyup    = function(e) {return ACKeyUp(this.getAttribute('id'), e);}
        __AC[id]['element'].onkeypress = function(e) {if (!e) e = window.event; if (e.keyCode == 13 /*|| isOpera*/) return false;}
        __AC[id]['element'].ondblclick = function() {ACShowDropdown(this.getAttribute('id'));}
        __AC[id]['element'].onclick    = function(e) {if (!e) e = window.event; e.cancelBubble = true; e.returnValue = false;}

        // Hides the dropdowns when document clicked
        var docClick = function()
        {
           for (id in __AC) {
               ACHideDropdown(id);
           }
        }

        if (document.addEventListener) {
            document.addEventListener('click', docClick, false);
        } else if (document.attachEvent) {
            document.attachEvent('onclick', docClick, false);
        }


        // Max number of items shown at once
        if (arguments[2] != null) {
            __AC[id]['maxitems'] = arguments[2];
            __AC[id]['firstItemShowing'] = 0;
            __AC[id]['lastItemShowing']  = arguments[2] - 1;
        }
        
        ACCreateDropdown(id);
        
        // Prevent select dropdowns showing thru
        if (isIE) {
            __AC[id]['iframe'] = document.createElement('iframe');
            __AC[id]['iframe'].id = id +'_iframe';
            __AC[id]['iframe'].style.position = 'absolute';
            __AC[id]['iframe'].style.top = '0';
            __AC[id]['iframe'].style.left = '0';
            __AC[id]['iframe'].style.width = '0px';
            __AC[id]['iframe'].style.height = '0px';
            __AC[id]['iframe'].style.zIndex = '98';
            __AC[id]['iframe'].style.visibility = 'hidden';
            
            __AC[id]['element'].parentNode.insertBefore(__AC[id]['iframe'], __AC[id]['element']);
        }
    }


    function ACCreateDropdown(id)
    {
        var left  = ACGetLeft(__AC[id]['element']);
        var top   = ACGetTop(__AC[id]['element']) + __AC[id]['element'].offsetHeight;
        var width = __AC[id]['element'].offsetWidth;
    
        __AC[id]['dropdown'] = document.createElement('div');
        __AC[id]['dropdown'].className = 'ac'; // Don't use setAttribute()
    
        __AC[id]['element'].parentNode.insertBefore(__AC[id]['dropdown'], __AC[id]['element']);
        
        // Position it
        __AC[id]['dropdown'].style.left       = left + 'px';
        __AC[id]['dropdown'].style.top        = top + 'px';
        __AC[id]['dropdown'].style.width      = width + 'px';
        __AC[id]['dropdown'].style.zIndex     = '99';
        __AC[id]['dropdown'].style.visibility = 'hidden';
    }
    
	
    function ACGetLeft(element)
    {
        var curNode = element;
        var left    = 0;

        do {
            left += curNode.offsetLeft;
            curNode = curNode.offsetParent;

        } while(curNode.tagName.toLowerCase() != 'body');

        return left;
    }
    
	
    function ACGetTop(element)
    {
        var curNode = element;
        var top    = 0;

        do {
            top += curNode.offsetTop;
            curNode = curNode.offsetParent;

        } while(curNode.tagName.toLowerCase() != 'body');

        return top;
    }


    function ACShowDropdown(id)
    {
        ACHideAll();

        var value = __AC[id]['element'].value.toLowerCase();
        var toDisplay = new Array();
        var newDiv    = null;
        var text      = null;
        var numItems  = __AC[id]['dropdown'].childNodes.length;

        // Remove all child nodes from dropdown
        while (__AC[id]['dropdown'].childNodes.length > 0) {
            __AC[id]['dropdown'].removeChild(__AC[id]['dropdown'].childNodes[0]);
        }

        // Go thru data searching for matches
		var isTag = (__AC[id]['maxitems'] != null);
		var nb = 0;
		if (!isTag || value.length > 0)
        for (i=0; i<__AC[id]['data'].length && nb<100; ++i) {
			var elem = __AC[id]['data'][i];
            if (!isTag || (elem != value && elem.substr(0, value.length) == value))
			{
                toDisplay[toDisplay.length] = __AC[id]['data'][i];
				nb++;
            }
        }
        
        // No matches?
        if (toDisplay.length == 0) {
            ACHideDropdown(id);
            return;
        }

		newDiv = document.createElement('div');
		newDiv.className = 'ac_title';
		newDiv.style.zIndex = '99';
		newDiv.appendChild(document.createTextNode('Type any keyword or select:'));
		__AC[id]['dropdown'].appendChild(newDiv);

        // Add data to the dropdown layer
        for (i=0; i<toDisplay.length; ++i) {
            newDiv = document.createElement('div');
            newDiv.className = 'ac_item'; // Don't use setAttribute()
            newDiv.setAttribute('id', 'ac_item_' + i);
            newDiv.setAttribute('index', i+1);
            newDiv.style.zIndex = '99';
            
             // Scrollbars are on display ?
            if (toDisplay.length > __AC[id]['maxitems'] && navigator.userAgent.indexOf('MSIE') == -1) {
                newDiv.style.width = __AC[id]['element'].offsetWidth - 22 + 'px';
            }

            newDiv.onmouseover = function() {ACHighlightItem(__AC[id]['element'].getAttribute('id'), this.getAttribute('index'));};
            newDiv.onclick     = function() {ACSetValue(__AC[id]['element'].getAttribute('id')); ACHideDropdown(__AC[id]['element'].getAttribute('id'));}
            
            text   = document.createTextNode(toDisplay[i]);
            newDiv.appendChild(text);
            
            __AC[id]['dropdown'].appendChild(newDiv);
        }
        
        
        // Too many items?
        if (toDisplay.length > __AC[id]['maxitems']) {
            __AC[id]['dropdown'].style.height = (__AC[id]['maxitems'] * 23) + 4 + 'px';
        
        } else {
            __AC[id]['dropdown'].style.height = '';
        }

        // Set left/top in case of document movement/scroll/window resize etc

        __AC[id]['dropdown'].style.left = ACGetLeft(__AC[id]['element']);
        __AC[id]['dropdown'].style.top  = ACGetTop(__AC[id]['element']) + __AC[id]['element'].offsetHeight;


        // Show the iframe for IE
        if (isIE) {
            __AC[id]['iframe'].style.top    = __AC[id]['dropdown'].style.top;
            __AC[id]['iframe'].style.left   = __AC[id]['dropdown'].style.left;
            __AC[id]['iframe'].style.width  = __AC[id]['dropdown'].offsetWidth;
            __AC[id]['iframe'].style.height = __AC[id]['dropdown'].offsetHeight;
            
            __AC[id]['iframe'].style.visibility = 'visible';
        }


        // Show dropdown
        if (!__AC[id]['isVisible']) {
            __AC[id]['dropdown'].style.visibility = 'visible';
            __AC[id]['isVisible'] = true;
        }

        
        // If now showing less items than before, reset the highlighted value
        if (__AC[id]['dropdown'].childNodes.length != numItems) {
            __AC[id]['highlighted'] = null;
        }
    }
    
    function ACHideDropdown(id)
    {
        if (__AC[id]['iframe']) {
            __AC[id]['iframe'].style.visibility = 'hidden';
        }


        __AC[id]['dropdown'].style.top = -2000; //__AC[id]['dropdown'].style.visibility = 'hidden';
        __AC[id]['highlighted'] = null;
        __AC[id]['isVisible']   = false;
    }
    
    
    function ACHideAll()
    {
        for (id in __AC) {
            ACHideDropdown(id);
        }
    }
    
   
    function ACHighlightItem(id, index)
    {
        if (__AC[id]['dropdown'].childNodes[index]) {
            for (var i=0; i<__AC[id]['dropdown'].childNodes.length; ++i) {
                if (__AC[id]['dropdown'].childNodes[i].className == 'ac_item_highlighted') {
                    __AC[id]['dropdown'].childNodes[i].className = 'ac_item';
                }
            }
            
            __AC[id]['dropdown'].childNodes[index].className = 'ac_item_highlighted';
            __AC[id]['highlighted'] = index;
        }
    }


    function ACHighlight(id, index)
    {
        // Out of bounds checking
        if (index == 1 && __AC[id]['highlighted'] == __AC[id]['dropdown'].childNodes.length - 1) {
            __AC[id]['dropdown'].childNodes[__AC[id]['highlighted']].className = 'ac_item';
            __AC[id]['highlighted'] = null;
        
        } else if (index == -1 && __AC[id]['highlighted'] == 0) {
            __AC[id]['dropdown'].childNodes[0].className = 'ac_item';
            __AC[id]['highlighted'] = __AC[id]['dropdown'].childNodes.length;
        }

        // Nothing highlighted at the moment
        if (__AC[id]['highlighted'] == null) {
            __AC[id]['dropdown'].childNodes[0].className = 'ac_item_highlighted';
            __AC[id]['highlighted'] = 0;

        } else {
            if (__AC[id]['dropdown'].childNodes[__AC[id]['highlighted']]) {
                __AC[id]['dropdown'].childNodes[__AC[id]['highlighted']].className = 'ac_item';
            }

            var newIndex = __AC[id]['highlighted'] + index;

            if (__AC[id]['dropdown'].childNodes[newIndex]) {
                __AC[id]['dropdown'].childNodes[newIndex].className = 'ac_item_highlighted';
                
                __AC[id]['highlighted'] = newIndex;
            }
        }
    }


    function ACSetValue(id)
    {
		var myvalue = __AC[id]['dropdown'].childNodes[__AC[id]['highlighted']].innerHTML;
		if (myvalue != 'Type any keyword or select:')
        	__AC[id]['element'].value = myvalue;
    }
    
    
    function ACScrollCheck(id)
    {
        // Scroll down, or wrapping around from scroll up
        if (__AC[id]['highlighted'] > __AC[id]['lastItemShowing']) {
            __AC[id]['firstItemShowing'] = __AC[id]['highlighted'] - (__AC[id]['maxitems'] - 1);
            __AC[id]['lastItemShowing']  = __AC[id]['highlighted'];
        }
        
        // Scroll up, or wrapping around from scroll down
        if (__AC[id]['highlighted'] < __AC[id]['firstItemShowing']) {
            __AC[id]['firstItemShowing'] = __AC[id]['highlighted'];
            __AC[id]['lastItemShowing']  = __AC[id]['highlighted'] + (__AC[id]['maxitems'] - 1);
        }
        
        __AC[id]['dropdown'].scrollTop = __AC[id]['firstItemShowing'] * 15;
    }


    function ACKeyDown(id)
    {
        // Mozilla
        if (arguments[1] != null) {
            event = arguments[1];
        }

        var keyCode = event.keyCode;

        switch (keyCode) {

            // Return/Enter
            case 13:
                if (__AC[id]['highlighted'] != null) {
                    ACSetValue(id);
                    ACHideDropdown(id);
                }
                
                event.returnValue = false;
                event.cancelBubble = true;
				document.f.submit();
                break;

            // Escape
            case 27:
                ACHideDropdown(id);
                event.returnValue = false;
                event.cancelBubble = true;
                break;
            
            // Up arrow
            case 38:
                if (!__AC[id]['isVisible']) {
                    ACShowDropdown(id);
                }
                
                ACHighlight(id, -1);
                ACScrollCheck(id, -1);
                return false;
                break;
            
            // Tab
            case 9:
                if (__AC[id]['isVisible']) {
                    ACHideDropdown(id);
                }
                return;
            
            // Down arrow
            case 40:
                if (!__AC[id]['isVisible']) {
                    ACShowDropdown(id);
                }
                
                ACHighlight(id, 1);
                ACScrollCheck(id, 1);
                return false;
                break;
        }
    }


    function ACKeyUp(id)
    {
        // Mozilla
        if (arguments[1] != null) {
            event = arguments[1];
        }

        var keyCode = event.keyCode;

        switch (keyCode) {
            case 13:
                event.returnValue = false;
                event.cancelBubble = true;
                break;

            case 27:
                ACHideDropdown(id);
                event.returnValue = false;
                event.cancelBubble = true;
                break;
            
            case 38:
            case 40:
                return false;
                break;

            default:
				if (__AC[id]['maxitems'] == null && keyCode != 9)
					ACHideDropdown(id);
                else ACShowDropdown(id); 
                break;
        }
    }
    
    
    function ACisVisible(id)
    {
        return __AC[id]['dropdown'].style.visibility == 'visible';
    }