Do you have ecart 4 or above? Universal Email 4 or above?
If so just use the checkout wizard to create the checkout pages and it will automatically create the code for you, including setting up Universal Email to send the email receipt.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.