Tracking down javascript error
<p>I inherited an old classic asp VB program which I have edited under VS 2010.  There is rather long javascript function ("check(this)") that validates the user-entered data upon submit. But now when the user clicks "continue" I am getting the following error:</p>

<p><img src="http://i.stack.imgur.com/DZY1Y.png" alt="screen print of submit and error"></p>

<p>How best to track down this error? I am running Windows 7.</p>
