How to get a notification if a job is running for too long

Hi everyone,

I'm using a SQL Server 2k5. Recently I got an occasional job issue, that is, sometimes(usually once in a week), the job was stuck in running status and didn't finish. So I wonder if there is a way to send me an notification email if a job is running for, say, more than 5 hours. Thank you very much for your time and efforts.

regards,

Oliver