Button - open e-mail

Hi all, 

I have a table (a) with an-email field with recipient, subject and body.
Table b already has a relationship with a whereby b has selected one record from a.

I would like a button in b that does the same as the e-mail field in a, ie, opens outlook and pre-completes recipient , subject and body from a. 

A bonus would be if I could also attach a pdf saved in image field in b. 

I do not want to use sendEmail as I want the e-mail sent from my own mailbox. I simply want it to open outlook, and fill the subject and body fields. 

Any suggestions?