An example for detecting event of mouse wheeling(IE / Firefox / Safari / Chrome / Opera) 

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function MouseWheel (e) {  
	var e = e | window.event;  
	alert(['scrolled ', (( e.wheelDelta <= 0 | e.detail > 0) ? 'down' : 'up')].join(''));  
}  
	  
// hook event listener on window object  
if ('onmousewheel' in window) {  
	window.onmousewheel = MouseWheel;  
} else if ('onmousewheel' in document) {  
	document.onmousewheel = MouseWheel;  
} else if ('addEventListener' in window) {  
	window.addEventListener("mousewheel", MouseWheel, false);  
	window.addEventListener("DOMMouseScroll", MouseWheel, false);  
}