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  <form class="form-horizontal" id="email">
 <fieldset>
 <div id="legend">
 <h3>Email Configuration</h3>
 
 <label for="mailer">Mailer</label>
 <select name="mailer" id="mailer">
 <option value="mail">PHP mail()</option>
 <option value="smtp">SMTP</option>
 </select>
 
 <div id="smtp-wrapper" style="display:none;">
 <label for="smtp_host">SMTP Host</label>
 <input type="text" class="input-xlarge" id="smtp_host" name="smtp_host">
 
 <label for="smtp_port">SMTP Port</label>
 <input type="text" class="input-xlarge" id="smtp_port" name="smtp_port">
 
 <label for="smtp_username">SMTP Username</label>
 <input type="text" class="input-xlarge" id="smtp_username" name="smtp_username">
 
 <label for="smtp_password">SMTP Password</label>
 <input type="text" class="input-xlarge" id="smtp_password" name="smtp_password">
 
 <label for="smtp_enc">SMTP Encryption</label>
 <input type="text" class="input-xlarge" id="smtp_enc" name="smtp_enc">
 <span class="help-block">
 Some servers require encryption (tls or ssl) set. Set it if your host requires that.
 </span>
 </div>
 
 
 <div class="control-group form-group">
 
 <div class="controls col-lg-offset-4 col-lg-8">
 <button id="email-settings" class="btn btn-success">Save Settings</button>
 </div>
 </div>
 </fieldset>
 </form>
 
 <script type="text/javascript">
 
 $('#mailer').on('change', function() {
 //alert( this.value );
 
 var mailer  = $("#mailer").val();
 //alert(mailer);
 
 if( mailer === "smtp"){
 $("#smtp-wrapper").css("display", "block");
 }else{
 $("#smtp-wrapper").css("display", "none");
 }
 })
 
 
 </script>
 
 
 
 
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