var googlemapobj;
function wheelZoom(event) {
	// Prevent from scrolling the page when zooming the map
	if(window.event) { event.returnValue = false; } // IE
	if(event.cancelable) { event.preventDefault(); } // DOM-Standard
	if((event.detail || -event.wheelDelta) < 0) {
	googlemapobj.zoomIn(); } else {
	googlemapobj.zoomOut(); }
}