Captcha Validation

hello, I have added a recaptcha in my website,but problem is, it takes small character ,if u enter in capital and viceversa.. ex: captcha:aBcDe entry by user:AbCdE In above example i show captcha and entry by user ,in this scenario ,captcha validation is true... please reply asap.. Thanks.. -- You received this message because you are subscribed to the Google Groups "reCAPTCHA" group. To unsubscribe from this group and stop receiving emails from it, send an email to recaptcha+unsubscribe@googlegroups.com. To post to this group, send email to recaptcha@googlegroups.com. Visit this group at http://groups.google.com/group/recaptcha. For more options, visit https://groups.google.com/groups/opt_out.