@version	1.3 

- added ReplyTo( $address ) method
- added Receipt() method - to add a mail receipt
- added optionnal charset parameter to Body() method. this should fix charset problem on some mail clients

@version	1.4

- added isHTML ( bool) method - so you can define the body as text/html or text/plain
- added ConvertUTF8mail ( str) method - to convert the from and subject to utf8 format read in most email programs
- changed From () method - to use the ConvertUTF8, now you param is an array or string, see the example