This cannot be done with FileMaker's send mail. The mail sent from it is plain text only. There are email plug ins that offer this capability, so you might web search for them and see what they have to offer here.
Thanks for your Ans
But i knew that.
I want to know how/which plugins supports this .
so plz tell that i am waiting your response.
Try 360 works mail plugin, i've used it with many of my clients, all are satisfied, you have the option to attach a file 'inline' which can be used inside the actual email. Not biased at all, but the 360works plugins are nice and easy to use
I don't have exhaustive knowledge of each email plug in. Surely you can do a web search for them and look up their specs?
Fancy emails can be sent by online email marketing services.
http://madmimi.com allows unlimited per month to 100 email addresses Free
http://mailchimp.com allows 12000 per month to 2000 email addresses Free
both have extensive tutorials in text and video.
Madmimi is drop dead simple with excellent support.
Mailchimp is a little more complex with additional features
Both track the recieved, clicked and allow unsubscribe.