I need to zoom in/out a picture, when I'm scrolling on that picture.
I'm asking you only about how to detect scroll in/out on the picture? I'm trying this (I've found it in the internet):

```
$('.map').scroll(function(event){
              if(event.originalEvent.wheelDelta /120 > 0) {
                alert('scrolling up !');
              }
             else{
               alert('scrolling down !');
              }
            }); 

```

//

```
 .map 

```

is the class of my picture.

It doesn't work for me ....