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I have referred below link to implement captcha in contact us page.

How to implement Magento Captcha in Contact- Us form?

The above code is working well even captcha is showing on contact us page.

I am also using contact form in the footer of the website.

The code is like below.

<div class="contact-block-footer footer-col last" id="contactFormFooter">
<h4><?php echo Mage::helper('contacts')->__('Contact form') ?></h4>
<form action="<?php echo $this->getUrl('') ?>contacts/index/post/" method="post">
 <div class="fieldset footer-col-content">
 <ul class="form-list">
 <li class="fields">
 <div class="field">
 <div class="input-box">
 <input name="name" id="name" title="<?php echo Mage::helper('contacts')->__('Name') ?>" value="<?php echo $this->escapeHtml($this->helper('contacts')->getUserName()) ?>" class="input-text required-entry" type="text" placeholder="<?php echo Mage::helper('contacts')->__('Name:') ?>"/>
 </div>
 </div>
 <div class="field">
 <div class="input-box">
 <input name="email" id="email" title="<?php echo Mage::helper('contacts')->__('Email') ?>" value="<?php echo $this->escapeHtml($this->helper('contacts')->getUserEmail()) ?>" class="input-text required-entry validate-email" type="text" placeholder="<?php echo Mage::helper('contacts')->__('Email:') ?>" />
 </div>
 </div>
 <div class="field">
 <div class="input-box">
 <textarea name="comment" id="comment" title="<?php echo Mage::helper('contacts')->__('Message') ?>" class="required-entry input-text" cols="5" rows="3" placeholder="<?php echo Mage::helper('contacts')->__('Message:') ?>"></textarea>
 </div>
 </div>
 </li>
 <?php echo $this->getChildHtml('form.additional.info'); ?>
 </ul>
 <div class="buttons-set-footer">
 <input type="text" name="hideit" id="hideit" value="" style="display:none !important;" />
 <button type="submit" title="<?php echo Mage::helper('contacts')->__('Send') ?>" class="button"><span><span><?php echo Mage::helper('contacts')->__('Send') ?></span></span></button>
 </div>
 </div>
 </form>
</div>

<script type="text/javascript">
 //<![CDATA[
 var contactFormFooter = new VarienForm('contactFormFooter', true);
 //]]>
</script>

I need to show captcha in this form also, Is there any possibility to show the captcha in the contact form i used in the footer?

Can anyone help me how to implement this one.

Thanks!!