JavaScript DHTML/Event onMethod/onMouseWheel
"onMouseWheel" Example
<source lang="html4strict">
<html> <body>
Move mouse in and move the mouse wheel up or down.
<img id="yourimage" src="http://www.wbex.ru/style/logo.png" width="500" height="500" onmousewheel="alert("Wheel Delta: " + event.wheelDelta);">
</body> </html>
</source>