function ConvertEvent(e, element) {

         var event = e || window.event;

         var resultEvent = {

             event: event,

             type: event.type,

             target: event.target || event.srcElement,

             relatedTarget: event.relatedTarget || event.fromElement || event.toElement,

             clientX: event.clientX,

             clientY: event.clientY,

             screenX: event.screenX,

             screenY: event.screenY,

 //            offsetX: event.offsetX,

 //            offsetY: event.offsetY,

             altKey: event.altKey,

             ctrlKey: event.ctrlKey,

             shiftKey: event.shiftKey,

             charCode: event.charCode || event.keyCode,

             charCodeValue: String.fromCharCode(event.charCode || event.keyCode),

             stopPropagation: event.stopPropagation || function () { return window.event.cancelBubble = true; },

             preventDefault: event.preventDefault || function () { return window.event.returnValue = false; }

         };

         return resultEvent;

     }

     var eventClass = window.Event = window.jasen.core.Event;

     eventClass.Convert = ConvertEvent;

 <form id="form1" runat="server">

    <div>

       <input type="text" value="mouse test" onkeydown="return convert(event);" />

        <input type="button" value="mouse test" onclick="return convert(event,this);" />

    </div>

    </form>

    <script type="text/javascript">

        function convert(e) {

            var eventResult = Event.Convert(e);

            var result = "";

            for (var p in eventResult) {

                result += (p.toString() + "\t\t --->" + (eventResult[p] == null ? "null" : eventResult[p]).toString() + "\n");

            }

            alert(result);

        }

    </script>