It looks like what your trying to do would require a server side scripting language such as php or asp. You will need this to include one page inside of another. or your can use an iframe.
the code for an iframe is this:
<iframe src="the url to the page you want to include" width="the width of...
well its not just HTML if you want an email to be sent with you, that requires a server side script such as PHP or ASP. the html coe where a user can type is <textarea name="mytext">Users text will go here!</textarea>. For the name="" , that can be whatever you want it to be. In my example the...