[jQuery] set focus on change

[Matt Williams]

I want to run a validation function after a user enters data. If the
validation fails, I want do an alert telling them so and set the focus
back to that field. But even at the most basic level, I can't get the
focus to stay / go back to the field that was changed. Interesting
that it does seem to work in IE 7, but not FF.

$(document).ready(function(){
  $('#testField').change(function() { alert('wrong value');
this.focus(); });
});

Any ideas here? Or suggestions on how to reset focus back to the field
that changed?

Thanks,

Matt