Script not working in 2008.1

Hi

We recently updated to 2008.1

However, I now find that a range of my suitescripts no longer work.  I have checked the release notes for depracations or alterations but did not find anything useful.  Here is an example of a script that was working that I use to change the company on a case from anonymous to something else so that we can easily identify cases submitted via email by employees. 

Can anyone suggest what may be wrong?

Thanks

Henry



function InternallyRaisedCase () {
  if ( type.toLowerCase() == 'create' ){

   var sender_email = nlapiGetNewRecord().getFieldValue('email');
     
   var filters = new Array();
   filters[0] = new nlobjSearchFilter('email',null,'isnotempty');