[jQuery] Filtering carachter input in a form field

[Giovanni Battista Lenoci]

Hi, I'm trying to filter keyboard input in a form field:
I'm using this piece of code:

function solonumeri(event) {
 alert(event.keyCode);
 if(event.keyCode > 47 && event.keyCode < 57) {
   alert(SOLO_NUMERI);
   return false;
 } else {
   return true;
 }
}

$().ready(function () {
 $('.only_number').bind('keyup', function(e) { return solonumeri(e) });
});

If i bind this function on the keyup or keydown event the first alert 
returns the right keycode, but if I change the event to keypress then it 
returns 0.

Any help?

Thank you



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