Only if you put the class on multiple checkboxes.

Something else I just thought of. Have you verified that there is only one checkbox with Id = AHYSChk01? I've made the mistake of having multiple objects with the same Id.

>Yes, yes I have...and yes it is.
>
>>Have you checked the source in the browser to verify that the Id is correctly translated to 'AHYSChk01' ?
>>
>>Might be safer to use a class to identify it. e.g: input type='checkbox' class='chk' .... and then:

$('.chk').click(function () { //etc});

>
>I thought of that, but wouldn't that do the same thing to ALL the checkboxes on the form?