html5 - sending email upon hitting submit in html or php -

i have simple site 3 input forms: first name, last name, , email address fields user fill out. want them able fill 3, , when hitting submit, email generated autofilled text, example:

email: user put email subject make, like, "regarding _"

and body of email use first , last name entered so:

dear __ __,

click here fill out bla bla bla etc

how go doing this?

any helpful links or tutorials fantastic

you can make simple html , process php. can :
index.php:

<form action='sendmail.php' method='post'>       <table>         <tr>             <td>firstname</td>             <td><input name="firstname" /></td>         </tr>         <tr>             <td>lastname</td>             <td><input name="firstname" /></td>         </tr>         <tr>             <td>lastname</td>             <td><input name="lastname" /></td>         </tr>         <tr>             <td>email</td>             <td><input name="email" /></td>         </tr>              <tr>             <td colspan="2"><input type='submit' value='send' /></td>         </tr>     </table> </form> 

sendmail.php:

$firstname = $_post['firstname']; $lastname = $_post['lastname']; $email = $_post['email'];  //build email content $emailsubject = "email subject"; $mailcontent = "regarding ".$firstname." ".$lastname; $mailcontent .= "more content here";  //send mail if(mail($email,$emailsubject,$mailcontent))      echo "mail send successful"; else     echo "mail send fail"; 

notice: suppose input param valid send mail. should add more validation input field.