>I am trying to incorporate into my project a masked input plug-in (URL: http://digitalbush.com/projects/masked-input-plugin/)
>
>When I add this .js
>

><script src="Scripts/jquery-1.7.1.js" type="text/javascript"></script>
><script src="Scripts/jquery.maskedinput-1.2.2.min.js" type="text/javascript"></script>
>

>to a separate .aspx file in my project, the mask() function works very well.
>
>But when I add it to a page that uses Master page, I get error:
>

>0x800a01b6 - Microsoft JScript runtime error: Object doesn't support property or method 'mask'
>

>
>The test code is identical in separate test page and the page that uses master page:
>
>

> <script type="text/javascript">
>        $(document).ready(function () {
>             $("#txtPhoneNumber").mask("(999) 9999-9999");
>        })
>    </script>
>

>
>The error (above) happens on the line .mask() above.
>
>How would you recommend to debug this situation? TIA

Do you have both scripts included into the master page ? (jQuery and plug-in)?