Mouse Zoom In and Mouse Zoom out code in Javascript

//Script for Mouse events.

<script language="javascript">

        window.onload = function () {

            if (window.addEventListener) {

 //Setting mouse event for the entire document, we also set the for particular event

                document.addEventListener('DOMMouseScroll', moveObject, false);

            }

            //for IE/OPERA etc

             document.onmousewheel = moveObject;

        }

        function moveObject(event) {

            var delta = 0;

            if (!event) event = window.event;

            // normalize the delta

            if (event.wheelDelta) {

                // IE and Opera

                delta = event.wheelDelta / 60;

            } else if (event.detail) {

                // W3C

                delta = -event.detail / 2;

            }

            var currPos = document.getElementById('scroll').offsetTop;

            //calculating the next position of the object

            var nextPos = parseInt(currPos) - (delta * 10);

            if (currPos > nextPos) {

                //code for zoom in

            }

            else {

                //code for zoom out

            }

        }

    </script>

     //HTML Code – Div for setting the Mouse event (up/down) dynamically

     <div id="scroll" style="position: absolute;display:none;">

    </div>