Embedding jpg images in an email

"[email protected] [blat]" <[email protected]>
Newsgroups gmane.mail.blat
Message-ID <[email protected]> 
This is the line of code that is being added to our "blat" program
 

 -embed "<img src=cid:testimage.jpg>"
 

 Our program compiles and runs but there is no image in the email
 

 I have never used cid before.
 The testimage file resides in the c:\  directory of my machine
 

 1. How does a jpg file get recognised by a cid statement?
 2. Are any extra commands to be sent to blat rather than the above
 3. Any ideas what I am doing wrong?
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