I just want to know how can I add captcha on mage_newsletter on each page of site. Here my .xml code block for view captcha
<block type="core/text_list" name="form.additional.info">
<block type="captcha/captcha" name="captcha">
<reference name="head">
<action method="addJs"><file>mage/captcha.js</file></action>
</reference>
<action method="setFormId"><formId>contacts</formId></action>
<action method="setImgWidth"><width>230</width></action>
<action method="setImgHeight"><width>50</width></action>
</block>
</block>