>>>OK, I put them in a folder and added the folder to my project, then dragged them onto the page. This is what got put in:
>>>
>>>

    <script src="js/jquery.js" type="text/javascript"></script>
>>>
>>>    <script src="js/jquery.maskedinput.js" type="text/javascript"></script>
>>>

>>>
>>>But I can still add non-numeric characters to the text box.
>>>
>>
>>Are you sure you have all the rest of the hookup done for this?
>>Tim
>
>No, I'm not sure. What rest of the hookup is there besides getting the libraries and calling them?

That is all I was referring to. I would take Eric's advice at this point and verify your calls are being used. Firebug is a good tool for that.
Tim