I have an order form that calculates the total, but the total is saved in a <div> and not in the form so when I hit submit, I get everything emailed except the total. Any ideas on how I fix this?

Here is the link: APP

Code:
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1" />
    <title>M'Prints Estimate</title>
    <script type="text/javascript" src="js/formcalculations.js"></script>
    <link rel="stylesheet" href="themes/mprints.min.css" />
		<link rel="stylesheet" href="http://code.jquery.com/mobile/1.1.0/jquery.mobile.structure-1.1.0.min.css" />
		<script src="http://code.jquery.com/jquery-1.7.1.min.js"></script>
		<script src="http://code.jquery.com/mobile/1.1.0/jquery.mobile-1.1.0.min.js"></script>
</head>

<body onload='hideTotal()'>

    <div id="wrap">
        <form action="" id="estimateform" onsubmit="return false;">
        <div>
        <div class="cont_details">
            	<fieldset>
                <legend>Contact Details</legend>
                 <label for='date_created'>Date Created</label>
                <input type="text" id="date_created" name='date_created' />
                <br/>
                <label for='customer_name'>Customer Name</label>
                <input type="text" id="customer_name" name='customer_name' />
                <br/>
                <label for='customer_contact'>Customer Contact</label>
                <input type="text" id="customer_contact" name='customer_contact' />
                <br/>
                <label for='customer_email'>Customer Contact Email</label>
                <input type="text"  id="customer_email" name='customer_email'/>
                <br/>
                 <label for='opportunity_name'>Opportunity Name</label>
                <input type="text"  id="opportunity_name" name='opportunity_name'/>
                <br/>
                 <label for='due_date'>Date Order Due to Customer</label>
                <input type="text"  id="due_date" name='due_date'/>
                <br/>
                </fieldset>
            </div>
            <div class="cont_order">
               <fieldset>
                <legend>Make your estimate!</legend>
                <label >Colors</label>
                <label >Front</label>
                <select id="front" name='front' onchange="calculateTotal()">
                <option value="None">Select</option>
                <option value="One">One</option>
                <option value="Two">Two</option>
                <option value="Three">Three</option>
                <option value="Four">Four</option>
                <option value="Five">Five</option>
                <option value="Six">Six</option>
                <option value="Seven">Seven</option>
               </select>
                <br/>
                <label >Back</label>
                <select id="back" name='back' onchange="calculateTotal()">
                <option value="None">Select</option>
                <option value="One">One</option>
                <option value="Two">Two</option>
                <option value="Three">Three</option>
                <option value="Four">Four</option>
                <option value="Five">Five</option>
                <option value="Six">Six</option>
                <option value="Seven">Seven</option>
               </select>
                <br/>
                <label >Other</label>
                <select id="other" name='other' onchange="calculateTotal()">
                <option value="None">Select</option>
                <option value="One">One</option>
                <option value="Two">Two</option>
                <option value="Three">Three</option>
                <option value="Four">Four</option>
                <option value="Five">Five</option>
                <option value="Six">Six</option>
                <option value="Seven">Seven</option>
               </select>
                <br/>
                
                <label >Screens (Front)</label>               
                <select id="screens_front" name='screens_front' onchange="calculateTotal()">
                <option value="None">Select</option>
                <option value="One">One</option>
                <option value="Two">Two</option>
                <option value="Three">Three</option>
                <option value="Four">Four</option>
                <option value="Five">Five</option>
                <option value="Six">Six</option>
                <option value="Seven">Seven</option>
               </select>
                <br/>
              
                <label >Art Hours</label>
                <select id="art" name='art' onchange="calculateTotal()">
                <option value="One">One</option>
                <option value="Two">Two</option>
                <option value="Three">Three</option>
                <option value="Four">Four</option>
                <option value="Five">Five</option>
               </select>
                <br/>
                <label >Color Changes</label>
                <select id="color_change" name='color_change' onchange="calculateTotal()">
                <option value="None">None</option>
                <option value="One">One</option>
                <option value="Two">Two</option>
                <option value="Three">Three</option>
                <option value="Four">Four</option>
                <option value="Five">Five</option>
               </select>
                <br/>
                <p>
                <label for='includerushs' class="inlinelabel">Rush</label>
               <input type="checkbox" id="includerushs" name='includerushs' onclick="calculateTotal()" />
               </p>
               
                <p>
                <label class="inlinelabel" for='includeless_than_minimum'>Less Than Minimum</label>
                <input type="checkbox" id="includeless_than_minimum" name="includeless_than_minimum" onclick="calculateTotal()" />
                </p>
                <div id="totalPrice"></div>
                
                </fieldset>
            </div>
            
            <input type='submit' id='submit' value='Submit' onclick="calculateTotal()" />
        </div>  
       </form>
	</div><!--End of wrap-->

</body>
</html>