on the contactus.php page, that code that writes the security question is:
<label for="Security_code" >
<?php require_once("WA_ValidationToolkit/WAVT_CaptchaSecurityQuestion.php"); ?>
</label>
change that to
<label for="Security_code" >
<span style="color:#fff;"><?php require_once("WA_ValidationToolkit/WAVT_CaptchaSecurityQuestion.php"); ?></span>
</label>