function AutoSuggestControl(oTextbox, oProvider)
{
    this.cur /*:int*/ = -1;
    this.layer = null;
    this.provider /*:SuggestionProvider*/ = oProvider;
    this.textbox /*:HTMLInputElement*/ = oTextbox;
    this.init();
	
}

AutoSuggestControl.prototype.autosuggest = function (aSuggestions, bTypeAhead)
{
    if (aSuggestions != null)
    {	
        if (aSuggestions.length > 0) 
    	{
            if (bTypeAhead) 
	    {
               this.typeAhead(aSuggestions[0]);
            }
        
            this.showSuggestions(aSuggestions);
        } 
	else 
	{
            this.hideSuggestions();
        }
    }
};

AutoSuggestControl.prototype.createDropDown = function () {

    var oThis = this;

    //create the layer and assign styles
    this.layer = document.createElement("div");
    this.layer.className = "suggestions";
    this.layer.style.visibility = "hidden";
    this.layer.style.width = this.textbox.offsetWidth + 'px';
	this.layer.style.minWidth = this.textbox.offsetWidth + 'px';
	this.textbox.setAttribute("autocomplete","off");
	
    //when the user clicks on the a suggestion, get the text (innerHTML)
    //and place it into a textbox
    this.layer.onmousedown = 
    this.layer.onmouseup = 
    this.layer.onmouseover = function (oEvent) {
        oEvent = oEvent || window.event;
        oTarget = oEvent.target || oEvent.srcElement;

        if (oEvent.type == "mousedown") {
            oThis.textbox.value = oTarget.firstChild.nodeValue;
            oThis.hideSuggestions();
        } else if (oEvent.type == "mouseover") {
            oThis.highlightSuggestion(oTarget);
        } else {
            oThis.textbox.focus();
        }
    };
    
    
    document.body.appendChild(this.layer);
};

/**
 * Gets the left coordinate of the textbox.
 * @scope private
 * @return The left coordinate of the textbox in pixels.
 */
AutoSuggestControl.prototype.getLeft = function () /*:int*/ {

    var oNode = this.textbox;
    var iLeft = 0;
    
    while(oNode.tagName != "BODY" && oNode.tagName != "HTML") 
	{
        iLeft += oNode.offsetLeft;
        oNode = oNode.offsetParent;        
    }
    
    return iLeft;
};

/**
 * Gets the top coordinate of the textbox.
 * @scope private
 * @return The top coordinate of the textbox in pixels.
 */
AutoSuggestControl.prototype.getTop = function () /*:int*/ {

    var oNode = this.textbox;
    var iTop = 0;
    
    while(oNode.tagName != "BODY" && oNode.tagName != "HTML") 
	{
        iTop += oNode.offsetTop;
        oNode = oNode.offsetParent;
    }
    
    return iTop;
};

/**
 * Handles three keydown events.
 * @scope private
 * @param oEvent The event object for the keydown event.
 */
AutoSuggestControl.prototype.handleKeyDown = function (oEvent /*:Event*/) {

    switch(oEvent.keyCode) 
	{
        case 38: //up arrow
            this.previousSuggestion();
            break;
        case 40: //down arrow 
			if (this.isVisible())
			{
	            this.nextSuggestion();
			}
			else
			{
				this.showSuggestions(null);
			}
            break;
        case 13: //enter
            this.hideSuggestions();
            break;
		case 27: //escape
//			this.cur /*:int*/ = -1;
			this.hideSuggestions();	
			break;
    }

};

/**
 * Handles keyup events.
 * @scope private
 * @param oEvent The event object for the keyup event.
 */
AutoSuggestControl.prototype.handleKeyUp = function (oEvent /*:Event*/) {
    var iKeyCode = oEvent.keyCode;

    if (iKeyCode == 8 || iKeyCode == 46) 
	{
	    this.cur /*:int*/ = -1;
        this.provider.requestSuggestions(this, false);
    }
	else if (iKeyCode < 32 || (iKeyCode >= 33 && iKeyCode < 46) || (iKeyCode >= 112 && iKeyCode <= 123)) 
	{
        //ignore
    }
	else 
	{
	    this.cur /*:int*/ = -1;
        this.provider.requestSuggestions(this, true);
    }
};

/**
 * Hides the suggestion dropdown.
 * @scope private
 */
AutoSuggestControl.prototype.hideSuggestions = function () {
    this.layer.style.visibility = "hidden";
};

/**
 * Highlights the given node in the suggestions dropdown.
 * @scope private
 * @param oSuggestionNode The node representing a suggestion in the dropdown.
 */
AutoSuggestControl.prototype.highlightSuggestion = function (oSuggestionNode) {
    
    for (var i=0; i < this.layer.childNodes.length; i++) {
        var oNode = this.layer.childNodes[i];
        if (oNode == oSuggestionNode) {
            oNode.className = "current"
        } else if (oNode.className == "current") {
            oNode.className = "";
        }
    }
};

/**
 * Initializes the textbox with event handlers for
 * auto suggest functionality.
 * @scope private
 */
AutoSuggestControl.prototype.init = function () {

    var oThis = this;

//	this.textbox.setAttribute("autocomplete", "off");
    //assign the onkeyup event handler
    this.textbox.onkeyup = function (oEvent) {
    
        //check for the proper location of the event object
        if (!oEvent) {
            oEvent = window.event;
        }    
        
        //call the handleKeyUp() method with the event object
        oThis.handleKeyUp(oEvent);
    };
    
    //assign onkeydown event handler
    this.textbox.onkeydown = function (oEvent) {
    
        //check for the proper location of the event object
        if (!oEvent) {
            oEvent = window.event;
        }    
        
        //call the handleKeyDown() method with the event object
        oThis.handleKeyDown(oEvent);
    };
    
    //assign onblur event handler (hides suggestions)    
    this.textbox.onblur = function () {
        oThis.hideSuggestions();
    };
    
    //create the suggestions dropdown
    this.createDropDown();
};

/**
 * Highlights the next suggestion in the dropdown and
 * places the suggestion into the textbox.
 * @scope private
 */
AutoSuggestControl.prototype.nextSuggestion = function () {
    var cSuggestionNodes = this.layer.childNodes;
	
    if (cSuggestionNodes.length > 0 && this.cur < cSuggestionNodes.length - 1) 
	{
		this.cur++;
		
		if (this.cur >= 0)
		{
			var oNode = cSuggestionNodes[this.cur];
			this.highlightSuggestion(oNode);
			this.textbox.value = oNode.firstChild.nodeValue; 
		}
    }
};

/**
 * Highlights the previous suggestion in the dropdown and
 * places the suggestion into the textbox.
 * @scope private
 */
AutoSuggestControl.prototype.previousSuggestion = function () {
    var cSuggestionNodes = this.layer.childNodes;

    if (cSuggestionNodes.length > 0 && this.cur > 0) {
        var oNode = cSuggestionNodes[--this.cur];
        this.highlightSuggestion(oNode);
        this.textbox.value = oNode.firstChild.nodeValue;   
    }
};

/**
 * Selects a range of text in the textbox.
 * @scope public
 * @param iStart The start index (base 0) of the selection.
 * @param iLength The number of characters to select.
 */
AutoSuggestControl.prototype.selectRange = function (iStart /*:int*/, iLength /*:int*/) {

    //use text ranges for Internet Explorer
    if (this.textbox.createTextRange) {
        var oRange = this.textbox.createTextRange(); 
        oRange.moveStart("character", iStart); 
        oRange.moveEnd("character", iLength - this.textbox.value.length);      
        oRange.select();
        
    //use setSelectionRange() for Mozilla
    } else if (this.textbox.setSelectionRange) {
        this.textbox.setSelectionRange(iStart, iLength);
    }     

    //set focus back to the textbox
    this.textbox.focus();      
}; 


/**
 * Builds the suggestion layer contents, moves it into position,
 * and displays the layer.
 * @scope private
 * @param aSuggestions An array of suggestions for the control.
 */
AutoSuggestControl.prototype.showSuggestions = function (aSuggestions /*:Array*/) 
{
	if (aSuggestions != null)
	{
		var oDiv = null;
		this.layer.innerHTML = "";  //clear contents of the layer
		
		for (var i=0; i < aSuggestions.length; i++) {
			oDiv = document.createElement("div");
			oDiv.appendChild(document.createTextNode(aSuggestions[i]));
			this.layer.appendChild(oDiv);
		}
	}
	
	if (this.layer.innerHTML != '')
	{
		this.layer.style.left = this.getLeft() + "px";
		this.layer.style.top = (this.getTop()+this.textbox.offsetHeight) + "px";
		this.layer.style.visibility = "visible";
		this.layer.style.position = "absolute";
	}
};

AutoSuggestControl.prototype.isVisible = function ()
{
	return this.layer.style.visibility == "visible";
}

/**
 * Inserts a suggestion into the textbox, highlighting the 
 * suggested part of the text.
 * @scope private
 * @param sSuggestion The suggestion for the textbox.
 */
AutoSuggestControl.prototype.typeAhead = function (sSuggestion /*:String*/) {

    //check for support of typeahead functionality
    if (this.textbox.createTextRange || this.textbox.setSelectionRange){
        var iLen = this.textbox.value.length; 
        this.textbox.value = sSuggestion; 
        this.selectRange(iLen, sSuggestion.length);
    }
};