You need to read the API to see what it's doing. You've actually got two problems (note - I'm working on 4.0 at the moment, so I'm using the 4.0 API, you should use the correct API)
http://docs.atlassian.com/jira/4.0.2/ and look for the "Issue" object
The first problem is that getIssueType is deprecated and you should really be using getIssueTypeObject . Whichever method you use, you'll see that both calls return an object, not a string or number. What you need to do is read that for your issue type.
i.e. you really need $issue.getIssueTypeObject().getId or even $issue.getIssueTypeObject().getName might be more useful
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