MouseWheel all browsers

mousewheelall.js

function handle(delta) {
    if (delta < 0){
        /* scrolling up */
        
    } else {
        /* scrolling down */
        
    }
}
function wheel(event){var delta=0;if(!event)event=window.event;if(event.wheelDelta){delta=event.wheelDelta/120;if(window.opera)delta=-delta;}else if(event.detail){delta=-event.detail/3;}if(delta)handle(delta);if(event.preventDefault)event.preventDefault();event.returnValue=false;}if(window.addEventListener)window.addEventListener('DOMMouseScroll',wheel,false);window.onmousewheel=document.onmousewheel=wheel;