I'm looking to know if I pull the middle portion of a HTML form via AJAX if the data entered in the form will actually submit? I'm pulling the middle portion based in a selection made via radio buttons at the top of the form. The middle portion contains the bulk of the form, which changes based on which user account type the user wants to register for.

Here's the HTML Form:

The <div id="signup_forms"> line is where the AJAX is inserted.
Code:
	<div class="register_wrapper">
		<form action="">
			<div class="register_account_type_position">
			<p class="signup_title">Sign-Up for - Step One</p>
			<p class="register_account_type_title">Account Type:</p>
			<span class="register_account_type_personal_position"><input type="radio" value="personal" name="register_account_type" id="register_account_type_personal" class="register_account_type_personal" onclick="sendReq(\'personal\');" '; if((isset($_SESSION['account_type']) && $_SESSION['account_type']=="personal") || !isset($_SESSION['account_type'])){ $content.='checked="checked" '; } $content.='/> <label for="register_account_type_personal"><span class="register_radio_text">Personal</span></label></span>
			<span class="register_account_type_music_position"><input type="radio" value="music" name="register_account_type" id="register_account_type_music" class="register_account_type_music" onclick="sendReq(\'music\');" '; if(isset($_SESSION['account_type']) && $_SESSION['account_type']=="music"){ $content.='checked="checked" '; } $content.='/> <label for="register_account_type_music"><span class="register_radio_text">Band/Recording Artist</span></label></span>
			<span class="register_account_type_film_position"><input type="radio" value="film" name="register_account_type" id="register_account_type_film" class="register_account_type_film" onclick="sendReq(\'film\');" '; if(isset($_SESSION['account_type']) && $_SESSION['account_type']=="film"){ $content.='checked="checked" '; } $content.='/> <label for="register_account_type_film"><span class="register_radio_text">Filmmaker/Actor</span></label></span>
			<span class="register_account_type_business_position"><input type="radio" value="business" name="register_account_type" id="register_account_type_business" class="register_account_type_business" onclick="sendReq(\'business\');" '; if(isset($_SESSION['account_type']) && $_SESSION['account_type']=="business"){ $content.='checked="checked" '; } $content.='/> <label for="register_account_type_business"><span class="register_radio_text">Business</span></label></span>
			<span class="register_account_type_other_position"><input type="radio" value="business" name="register_account_type" id="register_account_type_other" class="register_account_type_other" onclick="sendReq(\'other\');" '; if(isset($_SESSION['account_type']) && $_SESSION['account_type']=="other"){ $content.='checked="checked" '; } $content.='/> <label for="register_account_type_other"><span class="register_radio_text">Other</span></label></span>
			</div>
		<div id="signup_forms">
			<div class="register_form_wrapper">
			<p class="register_form_position">
			<label for="register_email"><span class="register_form_text">Email:</span></label> <input type="email" value="'.$_SESSION['register_email'].'" name="register_email" id="register_email" class="register_form" />
			</p>
			<p class="register_form_position">
			<label for="register_fname"><span class="register_form_text">First Name:</span></label> <input type="text" value="'.$_SESSION['register_fname'].'" name="register_fname" id="register_fname" class="register_form" />
			</p>
			<p class="register_form_position">
			<label for="register_lname"><span class="register_form_text">Last Name:</span></label> <input type="text" value="'.$_SESSION['register_lname'].'" name="register_lname" id="register_lname" class="register_form" />
			</p>
			<p class="register_form_position">
			<label for="register_check_email"><span class="register_form_text">Re-enter Email:</span></label> <input type="email" value="'.$_SESSION['register_check_email'].'" name="register_check_email" id="register_check_email" class="register_form" />
			</p>
			<p class="register_form_position">
			<label for="register_password"><span class="register_form_text">New Password:</span></label> <input type="password" value="'.$_SESSION['register_password'].'" name="register_password" id="register_password" class="register_form" />
			</p>
			<p class="register_form_position">
			<label for="register_check_password"><span class="register_form_text">Re-enter Password:</span></label> <input type="password" value="'.$_SESSION['register_check_password'].'" name="register_check_password" id="register_check_password" class="register_form" />
			</p>
			<p class="register_form_position_gender">
			Gender:
			<select name="gender" id="gender">
			<option value=""></option>
			<option value="Female">Female</option>
			<option value="Male">Male</option>
			</select>
			</p>
			<p class="register_form_position_birthday">
			Birthday:
			<select name="month" id="month" onchange="sndReq(year.value,this.value);">
			<option value="">Month</option>
			<option value="January">January</option>
			<option value="February">February</option>
			<option value="March">March</option>
			<option value="April">April</option>
			<option value="June">June</option>
			<option value="July">July</option>
			<option value="August">August</option>
			<option value="September">September</option>
			<option value="October">October</option>
			<option value="November">November</option>
			<option value="December">December</option>
			</select>
			<select name="day" id="day">
			<option>Day</option>'."\n".
			$day_menu
			.'</select>
			<select name="year" id="year" onchange="sndReq(this.value,month.value);">
			<option>Year</option>'."\n".
			$year_menu
			.'</select>
			</p>
				<div class="register_membership_type_position">
				<span class="register_membership_type_title">Membership Type:</span>
				<span class="register_membership_type_basic_position"><input type="radio" value="basic" name="register_membership_type" id="register_membership_type_basic" class="register_membership_type_basic" '; if((isset($_SESSION['membership_type']) && $_SESSION['membership_type']=="basic") || !isset($_SESSION['membership_type'])){ $content.='checked="checked" '; } $content.='/> <label for="register_membership_type_basic"><span class="register_radio_text">Basic</span></label></span>
				<span class="register_membership_type_premium_position"><input type="radio" value="premium" name="register_membership_type" id="register_membership_type_premium" class="register_membership_type_premium" '; if(isset($_SESSION['membership_type']) && $_SESSION['membership_type']=="premium"){ $content.='checked="checked" '; } $content.='/> <label for="register_membership_type_premium"><span class="register_radio_text">Premium</span></label></span>
				<span class="register_membership_type_platinum_position"><input type="radio" value="platinum" name="register_membership_type" id="register_membership_type_platinum" class="register_membership_type_platinum" '; if(isset($_SESSION['membership_type']) && $_SESSION['membership_type']=="platinum"){ $content.='checked="checked" '; } $content.='/> <label for="register_membership_type_platinum"><span class="register_radio_text">Platinum</span></label></span>
				</div>
			</div>
		</div>
			<p class="register_form_position">
			<input type="submit" value="Sign Up for Basic Membership" class="register_button_position" />
			</p>
		</form>
	</div>
The current page pulled via AJAX:

PHP Code:
<?php
require_once 'function.php';
$form_type=$_GET['signup_type'];

if(
$form_type=="music"){
$content.='Test';
}
elseif(
$form_type=="film"){
$content.='Test2';
}
elseif(
$form_type=="business"){
$content.='Test3';
}
elseif(
$form_type=="other"){
$content.='Test4';
}
else{
$year_menu=generateBirthYearMenu(date("Y"));
$day_menu=generateBirthDayMenu(null,null);
$content.='<div class="register_form_wrapper">
            <p class="register_form_position">
            <label for="register_email"><span class="register_form_text">Email:</span></label> <input type="email" value="'
.$_SESSION['register_email'].'" name="register_email" id="register_email" class="register_form" />
            </p>
            <p class="register_form_position">
            <label for="register_fname"><span class="register_form_text">First Name:</span></label> <input type="text" value="'
.$_SESSION['register_fname'].'" name="register_fname" id="register_fname" class="register_form" />
            </p>
            <p class="register_form_position">
            <label for="register_lname"><span class="register_form_text">Last Name:</span></label> <input type="text" value="'
.$_SESSION['register_lname'].'" name="register_lname" id="register_lname" class="register_form" />
            </p>
            <p class="register_form_position">
            <label for="register_check_email"><span class="register_form_text">Re-enter Email:</span></label> <input type="email" value="'
.$_SESSION['register_check_email'].'" name="register_check_email" id="register_check_email" class="register_form" />
            </p>
            <p class="register_form_position">
            <label for="register_password"><span class="register_form_text">New Password:</span></label> <input type="password" value="'
.$_SESSION['register_password'].'" name="register_password" id="register_password" class="register_form" />
            </p>
            <p class="register_form_position">
            <label for="register_check_password"><span class="register_form_text">Re-enter Password:</span></label> <input type="password" value="'
.$_SESSION['register_check_password'].'" name="register_check_password" id="register_check_password" class="register_form" />
            </p>
            <p class="register_form_position_gender">
            Gender:
            <select name="gender" id="gender">
            <option value=""></option>
            <option value="Female">Female</option>
            <option value="Male">Male</option>
            </select>
            </p>
            <p class="register_form_position_birthday">
            Birthday:
            <select name="month" id="month" onchange="sndReq(year.value,this.value);">
            <option value="">Month</option>
            <option value="January">January</option>
            <option value="February">February</option>
            <option value="March">March</option>
            <option value="April">April</option>
            <option value="June">June</option>
            <option value="July">July</option>
            <option value="August">August</option>
            <option value="September">September</option>
            <option value="October">October</option>
            <option value="November">November</option>
            <option value="December">December</option>
            </select>
            <select name="day" id="day">
            <option>Day</option>'
."\n".
            
$day_menu
            
.'</select>
            <select name="year" id="year" onchange="sndReq(this.value,month.value);">
            <option>Year</option>'
."\n".
            
$year_menu
            
.'</select>
            </p>
                <div class="register_membership_type_position">
                <span class="register_membership_type_title">Membership Type:</span>
                <span class="register_membership_type_basic_position"><input type="radio" value="basic" name="register_membership_type" id="register_membership_type_basic" class="register_membership_type_basic" '
; if((isset($_SESSION['membership_type']) && $_SESSION['membership_type']=="basic") || !isset($_SESSION['membership_type'])){ $content.='checked="checked" '; } $content.='/> <label for="register_membership_type_basic"><span class="register_radio_text">Basic</span></label></span>
                <span class="register_membership_type_premium_position"><input type="radio" value="premium" name="register_membership_type" id="register_membership_type_premium" class="register_membership_type_premium" '
; if(isset($_SESSION['membership_type']) && $_SESSION['membership_type']=="premium"){ $content.='checked="checked" '; } $content.='/> <label for="register_membership_type_premium"><span class="register_radio_text">Premium</span></label></span>
                <span class="register_membership_type_platinum_position"><input type="radio" value="platinum" name="register_membership_type" id="register_membership_type_platinum" class="register_membership_type_platinum" '
; if(isset($_SESSION['membership_type']) && $_SESSION['membership_type']=="platinum"){ $content.='checked="checked" '; } $content.='/> <label for="register_membership_type_platinum"><span class="register_radio_text">Platinum</span></label></span>
                </div>
            </div>'
;
}

echo 
$content;

?>