Submitting form to database, and sending email with one button

I know how to insert data, but i dont know how to send an email at the same time as inserting data!

To insert the record, I am using the default dreamweaver server behaviours. But i am unsure as to how to send an email along with the submission.

This is what I have at the moment: (Im not sure where to go from here)

This is what I have at the moment:

<div class="main">

<div class="heading1">Contact Us</div>

<div class="heading2">Please fill out the form below, and we will get back to you as soon as possible!</div>

  <div class="contactform">

                 <div class="tableframe">

                   <form action="?" method="POST" name="contactform" id="contactform">

              <table width="100%" border="0" cellpadding="5">

                      <tr>

                         <td><div class="formtag">First Name</div>

                           <span id="sprytextfield1">

                           <label for="firstname"></label>

                           <input class="textfieldcap" type="text" name="firstname" id="firstname" />

                      <span class="textfieldRequiredMsg">Please enter you first name</span></span></td>

                    </tr>

                       <tr>

                         <td><div class="formtag">Last Name</div>

                           <span id="sprytextfield2">

                           <label for="lastname"></label>

                           <input class="textfieldcap" type="text" name="lastname" id="lastname" />

                           <span class="textfieldRequiredMsg">Please enter you last name</span></span></td>

                    </tr>

                       <tr>

                         <td><div class="formtag">Email</div>

                           <span id="sprytextfield3">

                        <label for="email"></label>

                        <input class="textfield" type="text" name="email" id="email" />

                      <span class="textfieldRequiredMsg">Please enter your email address</span><span class="textfieldInvalidFormatMsg">Please enter a valid email address</span></span></td>

                    </tr>

                       <tr>

                         <td><div class="formtag">Verify Email</div>

                           <span id="spryconfirm1">

                           <label for="verifyemail"></label>

                           <input class="textfield" type="text" name="verifyemail" id="verifyemail" />

                      <span class="confirmRequiredMsg">Please verify your email</span><span class="confirmInvalidMsg">Your emails do not match</span></span></td>

                    </tr>

                       <tr>

                         <td><div class="formtag">Mobile Number</div>

                           <span id="sprytextfield4">

                        <label for="mobilenumber"></label>

                        <input class="textfield" type="text" name="mobilenumber" id="mobilenumber" />

                      <span class="textfieldRequiredMsg">A value is required.</span><span class="textfieldInvalidFormatMsg">Invalid format.</span></span></td>

                    </tr>

                       <tr>

                         <td><div class="formtag">Your Message</div>

                           <span id="sprytextarea1">

                        <label for="message"></label>

                        <textarea class="textarea" name="message" id="message" cols="45" rows="5"></textarea>

                      <span style="color:#FFF" id="countsprytextarea1"></span><span class="textareaMaxCharsMsg">Exceeded maximum number of characters.</span><span class="textareaRequiredMsg">Please enter your message</span></span></td>

                    </tr>

                       <tr>

                         <td> </td>

                    </tr>

                       <tr>

                         <td align="center"><input name="submit" type="submit" class="buttonform" id="submit" value="Send" /></td>

                    </tr>

              </table>

           </form>

          </div>

        <br />

      </div>

   </div>

</div>