<div id="captchaBlock">
   <div id="whiteBlock">
      <img id="loaderImg" src="<?=SITE_TEMPLATE_PATH?>/i/ajax-loader.gif" />
   </div>
   <input id="captchaSid" type="hidden" name="captcha_sid" value="<?=$arResult['CAPTCHA_CODE']?>" />
   <img id="captchaImg" src="/bitrix/tools/captcha.php?captcha_sid=<?=$arResult['CAPTCHA_CODE']?>" width="180" height="40" alt="CAPTCHA" />
   <a id="reloadCaptcha"><?=GetMessage('RELOAD_CAPTCHA')?></a>
</div>
		

/*--CAPTCHA--*/

#captchaBlock{position:relative;}
#captchaBlock #whiteBlock{display:none; text-align:center; position:absolute; background-color:#FFF; width:180px; height:40px;}
#captchaBlock #whiteBlock #loaderImg{margin-top:3px;}

<script type="text/javascript">
   $(document).ready(function(){
      $('#reloadCaptcha').click(function(){
         $('#whiteBlock').show();
         $.getJSON('<?=$this->__folder?>/reload_captcha.php', function(data) {
            $('#captchaImg').attr('src','/bitrix/tools/captcha.php?captcha_sid='+data);
            $('#captchaSid').val(data);
            $('#whiteBlock').hide();
         });
         return false;
      });
   });
</script>
			

<?php
require($_SERVER['DOCUMENT_ROOT'].'/bitrix/modules/main/include/prolog_before.php');
echo json_encode($APPLICATION->CaptchaGetCode()); 
?>