diff --git a/auto.micro.js b/auto.micro.js
index 6874543..6180085 100644
--- a/auto.micro.js
+++ b/auto.micro.js
@@ -101,14 +101,14 @@ AutoSuggestControl.prototype.init = function () {
     //save a reference to this object
     var oThis = this;
     //assign the onkeyup event handler
-    lastDate = new Date();
+    var lastDate = new Date();
     oThis.textbox.onkeyup = function (oEvent) {
 
         //check for the proper location of the event object
         if (!oEvent) {
             oEvent = window.event;
         }
-        newDate = new Date();
+        var newDate = new Date();
         if (newDate.getTime() > lastDate.getTime() + 200) {
                 oThis.handleKeyUp(oEvent);
                 lastDate = newDate;