cssTwiddle 

$this.mousewheel( function(e, delta) {
    if(delta < 0) {
        opt.current = Math.max(opt.current - opt.inc, opt.min);
    }
    else {
        opt.current = Math.min(opt.current + opt.inc, opt.max);
    }
    var text_val = '' + opt.current + opt.suffix;
    $this.text(text_val);
    $target.css(opt.target_property, text_val);
    e.preventDefault();
});

• OSDC13