title: Troubleshoot a 'Sys' is undefined message in my upgraded web application
body: <p>I have a web application that was originally written on .Net 1.1 Framework.  I have since tried you upgrade it to .Net 3.5 Framework. I am now getting this javascript error throw on my page and for the life of me can't figure out exactly why.</p>
  
  <p>I have target the application for the .Net 3.5 framework, and even deleted and added back in the web.config file.  Any ideas on what to do to troubleshoot this?</p>
  
  <p><strong>Update 1/20/09 6:44pm</strong></p>
  
  <p>I verified my httpHandlers, per <a href="https://stackoverflow.com/users/33051/zhaph-ben-duguid">@Zhaph Ben Duguid</a> section looks good ... Created a new WebForm1.aspx page added a script manager and still getting the same error.</p>
  
  <p><strong>Resolution</strong></p>
  
  <p>It was an old component art javascript library that was throwing the error.</p>