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<input type="hidden" name="group_id" id="group_id" value="5" />

$group_id = $this->EE->config->item('default_member_group');

<div id="content">
<form id="register_member_form" method="post" action="http://www.url.com/index.php"  >
<div class='hiddenFields'>
<input type="hidden" name="XID" value="{XID_HASH}" />
<input type="hidden" name="ACT" value="15" />
<input type="hidden" name="RET" value="http://www.url.com/index.php/index" />
<input type="hidden" name="FROM" value="" />
<input type="hidden" name="site_id" value="1" />
</div>

<table class="tableBorder" border='0' cellspacing='0' cellpadding='0'>
<tr>
<td class='profileHeadingBG' colspan='2'><div class="tableHeading">Member Registration</div></td>

</tr><tr>

<td class='tableCellTwo'>div class='defaultBold'><span class="highlight">*</span> Username</div><div class='itempad'>Usernames must be at least 4 characters long</div></td>
<td class='tableCellOne'>input type="text" name="username" value="" maxlength="50" class="input" size="25"  ></td>

</tr><tr>

<td class='tableCellTwo'>div class='defaultBold'><span class="highlight">*</span> Password</div><div class='itempad'>Passwords must be at least 5 characters long</div></td>
<td class='tableCellOne'>input type="password" name="password" value="" maxlength="40" class="input" size="25"  ></td>

</tr><tr>

<td class='tableCellTwo'>div class='defaultBold'><span class="highlight">*</span> Confirm Password</div></td>
<td class='tableCellOne'>input type="password" name="password_confirm" value="" maxlength="40" class="input" size="25"  ></td>


</tr><tr>

<td class='tableCellTwo'>
<div class='defaultBold'><span class="highlight">*</span> Screen Name</div>
<div class='itempad'>If you leave this field blank, your screen name will be the same as your username</div>
</td>
<td class='tableCellOne'>input type="text" name="screen_name" value="" maxlength="50" class="input" size="25"  ></td>

</tr><tr>

<td class='tableCellTwo'>div class='defaultBold'><span class="highlight">*</span> Email Address</div></td>
<td class='tableCellOne'>input type="text" name="email" value="" maxlength="72" class="input" size="40"  ></td>

</tr><tr>

<td class='tableCellTwo'>div class='defaultBold'><span class="highlight">*</span> Confirm Email Address</div></td>
<td class='tableCellOne'>input type="text" name="email_confirm" value="" maxlength="72" class="input" size="40"  ></td>
 
</tr><tr>

<td colspan='2' class='tableCellOne'>
<div class="itempadbig">

<div class="itempad"><div class='defaultBold'>Terms of Service</div></div>

<textarea name='rules' class='textarea' rows='8' cols='90' readonly>
All messages posted at this site express the views of the author, and do not necessarily reflect the views of the owners and administrators of this site.

By registering at this site you agree not to post any messages that are obscene, vulgar, slanderous, hateful, threatening, or that violate any laws.   We will permanently ban all users who do so.   

We reserve the right to remove, edit, or move any messages for any reason.
</textarea>
</div>
</td>

</tr><tr>

<td colspan='2' class='tableCellOne'>


<input type="hidden" name="group_id" id="group_id" value="6" />
<input type='checkbox' name='accept_terms' value='y'  />  <span class="alert">I agree to the terms of service</span>
<input type="submit" value="Submit" class="submit" /></p>
<span class="highlight">*</span> Indicates required fields

</td>
</tr>
</table>
</form>
</div>

if ($this->EE->config->item('req_mbr_activation') == 'manual' OR 
   $this->EE->config->item('req_mbr_activation') == 'email')
  {
   $data['group_id'] = 4;  // Pending
  }
  else
  {
   if ($this->EE->config->item('default_member_group') == '')
   {
    $data['group_id'] = 4;  // Pending
   }
   else
   {
    $data['group_id'] = $this->EE->config->item('default_member_group');
   }
  }

$edata = $this->EE->extensions->call('member_member_register_start');
   if ($this->EE->extensions->end_script === TRUE) return;