jsp - Captcha code incompatible with firefox -

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i using this captcha code in jsp. call jsp following code using iframe:

 <iframe id="captchaframe"  align="center" name="captchaframe" src="captcha.jsp" width="120" height="40" scrolling="no"       frameborder="0" marginheight="-10" marginwidth="-10"/></iframe>

with explorer works pretty in picture:

http://i53.tinypic.com/2n04glz.jpg

but in firefox characters become else entirely in picture:

http://i55.tinypic.com/9tpmw8.jpg

how can fix this?

i guess firefox doesn't recognise output of jsp file image. did set mime content-type image?

http://www.w3.org/protocols/rfc1341/4_content-type.html


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