Detect Mousewheel events by jQuery

$(function () {
var isChrome = !!window.chrome && !!window.chrome.webstore; //use to resolve browser compatibilty issue.
var functionname="mousewheel.focal";
if(!isChrome)
functionname="DOMMouseScroll";
$('Selector').bind(functionname, function{
var delta = (isChrome) ? e.delta || e.originalEvent.wheelDelta : e.originalEvent.detail;
if(isChrome && delta < 0){
//scroll down in chrome
}
elseif(isChrome && delta > 0){
//scroll up in chrome
}
elseif(!isChrome && delta > 0){
//scroll down in mozilla
}
else{
//scroll up in mozilla
}
return false;
});
});