source: products/quintagroup.captcha.core/trunk/quintagroup/captcha/core/skins/captcha_core/captcha_widget.pt

<div metal:define-macro="captcha"
     tal:omit-tag=""
     i18n:domain="quintagroup.captcha.core"
     tal:define="portal_url here/plone_portal_state/portal_url">
  <div class="field"
       tal:define="hk here/getCaptcha;
                   error errors/key|nothing"
       tal:attributes="class python:error and 'field error' or 'field'">
     <input type="hidden"
            name="hashkey"
            tal:attributes="value hk" />
     <label i18n:translate="enter_word">Enter the word below</label>
     <span class="fieldRequired" title="Required"
           i18n:domain="plone" i18n:attributes="title title_required;"
           i18n:translate="label_required">(Required)</span>
     <div class="formHelp"></div>
     <div tal:content="error">Validation error output</div>
     <input type="text"
            tabindex=""
            name="key"
            size="10"
            value=""/>
     <img tal:attributes="src string:${portal_url}/getCaptchaImage/${hk}" alt="Enter the word"/>
  </div>
</div>