change to input value does not trigger event in IE7

change to input value does not trigger event in IE7

This works in FF3 but not in IE7: I have a table of text inputs that are grouped together in pairs. If I change the value of the first, it runs a formula to calculate the value of the second and vice-versa.

Instead of binding events to each input, I bound the change event to the table that holds all the inputs. Then I check the target of the event to decide what to do. My script starts off like this:

$(document).ready(function() {
      $('#pkg_table').change(function(event) {
         var tgt = $(event.target);
         
         if(tgt.is('input'))
         {
// . . . mess with field values
         }
      });
});


When I change the value in one of the fields, nothing happens. No errors. No indication that the event even fires (not sure how to check in IE anyway). Very frustrating.
I'm also checking for click events on another page with similiar code, which is working fine in both browsers. I've been researching this for two days, and the only thing I've come across that even hints at my problem is this chart ( http://www.quirksmode.org/dom/events/ ) listing support for various DOM events in all the major browsers. It specifically mentioned IE support for change events involving checkboxes is extremely buggy. Surely someone has run into this issue before. Thanks in advance for any help you can give.

Chad