function AutoSuggestControl(oTextbox /*:HTMLInputElement*/, 
oProvider /*:SuggestionProvider*/) {
this.cur /*:int*/ = -1;
this.layer = null;
this.provider /*:SuggestionProvider*/ = oProvider;
this.textbox /*:HTMLInputElement*/ = oTextbox;
this.init();
}
AutoSuggestControl.prototype.autosuggest = function (aSuggestions /*:Array*/,
bTypeAhead /*:boolean*/) {
if (aSuggestions.length > 0) {
if (bTypeAhead) {
this.typeAhead(aSuggestions[0]);
}
this.showSuggestions(aSuggestions);
} else {
this.hideSuggestions();
}
};
AutoSuggestControl.prototype.createDropDown = function () {
var oThis = this;
this.layer = document.createElement("div");
this.layer.className = "suggestions";
this.layer.style.visibility = "hidden";
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);
};
AutoSuggestControl.prototype.getLeft = function () /*:int*/ {
var oNode = this.textbox;
var iLeft = 0;
while(oNode.tagName != "BODY") {
iLeft += oNode.offsetLeft;
oNode = oNode.offsetParent;        
}
return iLeft;
};
AutoSuggestControl.prototype.getTop = function () /*:int*/ {
var oNode = this.textbox;
var iTop = 0;
while(oNode.tagName != "BODY") {
iTop += oNode.offsetTop;
oNode = oNode.offsetParent;
}
return iTop;
};
AutoSuggestControl.prototype.handleKeyDown = function (oEvent /*:Event*/) {
switch(oEvent.keyCode) {
case 38: //up arrow
this.previousSuggestion();
break;
case 40: //down arrow 
this.nextSuggestion();
break;
case 13: //enter
this.hideSuggestions();
break;
this.textbox.focus();
}
};
AutoSuggestControl.prototype.handleKeyUp = function (oEvent /*:Event*/) {
var iKeyCode = oEvent.keyCode;
if (iKeyCode == 8 || iKeyCode == 46) {
this.provider.requestSuggestions(this, false);
} else if (iKeyCode < 32 || (iKeyCode >= 33 && iKeyCode < 46) || (iKeyCode >= 112 && iKeyCode <= 123)) {
} else {
this.provider.requestSuggestions(this, true);
}
};
AutoSuggestControl.prototype.hideSuggestions = function () {
this.layer.style.visibility = "hidden";
};
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 = "";
}
}
};
AutoSuggestControl.prototype.init = function () {
var oThis = this;
this.textbox.onkeyup = function (oEvent) {
if (!oEvent) {
oEvent = window.event;
}    
oThis.handleKeyUp(oEvent);
};
this.textbox.onkeydown = function (oEvent) {
if (!oEvent) {
oEvent = window.event;
}    
oThis.handleKeyDown(oEvent);
};
this.textbox.onblur = function () {
oThis.hideSuggestions();
};
this.createDropDown();
};
AutoSuggestControl.prototype.nextSuggestion = function () {
var cSuggestionNodes = this.layer.childNodes;
if (cSuggestionNodes.length > 0 && this.cur < cSuggestionNodes.length-1) {
var oNode = cSuggestionNodes[++this.cur];
this.highlightSuggestion(oNode);
this.textbox.value = oNode.firstChild.nodeValue; 
}
};
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;
}
};
AutoSuggestControl.prototype.selectRange = function (iStart /*:int*/, iLength /*:int*/) {
if (this.textbox.createTextRange) {
var oRange = this.textbox.createTextRange(); 
oRange.moveStart("character", iStart); 
oRange.moveEnd("character", iLength - this.textbox.value.length);      
oRange.select();
} else if (this.textbox.setSelectionRange) {
this.textbox.setSelectionRange(iStart, iLength);
}     
this.textbox.focus();
}; 
AutoSuggestControl.prototype.showSuggestions = function (aSuggestions /*:Array*/) {
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);
}
this.layer.style.left = this.getLeft() + "px";
this.layer.style.top = (this.getTop()+this.textbox.offsetHeight) + "px";
this.layer.style.visibility = "visible";
};
AutoSuggestControl.prototype.typeAhead = function (sSuggestion /*:String*/) {
if (this.textbox.createTextRange || this.textbox.setSelectionRange){
var iLen = this.textbox.value.length; 
this.selectRange(iLen, sSuggestion.length);
}
};