How to use captcha in flex?

Hi,
I am new to flex.
Can anyone tell me how to use the captcha in flex?
Is there any lib present for this?
Also, how should I do on server side validation for that?
Any help appreciated.
Thanks,
Tushar Gandhi.

a working example + source can be found here:
http://www.flexer.info/2007/11/09/captcha-in-flex-using-to-check-the-user/

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             <s:Button x="129" y="91" label="S" height="43" width="44"  fontSize="24" fontWeight="bold" click="keyboard_clickHandler(event)"  label.PRIMARY="s"/>
             <s:Button x="173" y="91" label="D" height="43" width="44"  fontSize="24" fontWeight="bold" click="keyboard_clickHandler(event)"  label.PRIMARY="d"/>
             <s:Button x="217" y="91" label="F" height="43" width="44"  fontSize="24" fontWeight="bold" click="keyboard_clickHandler(event)"  label.PRIMARY="f"/>
             <s:Button x="261" y="91" label="G" height="43" width="44"  fontSize="24" fontWeight="bold" click="keyboard_clickHandler(event)"  label.PRIMARY="g"/>
             <s:Button x="305" y="91" label="H" height="43" width="44"  fontSize="24" fontWeight="bold" click="keyboard_clickHandler(event)"  label.PRIMARY="h"/>
             <s:Button x="349" y="91" label="J" height="43" width="44"  fontSize="24" fontWeight="bold" click="keyboard_clickHandler(event)"  label.PRIMARY="j"/>
             <s:Button x="393" y="91" label="K" height="43" width="44"  fontSize="24" fontWeight="bold" click="keyboard_clickHandler(event)"  label.PRIMARY="k"/>
             <s:Button x="437" y="91" label="L" height="43" width="44"  fontSize="24" fontWeight="bold" click="keyboard_clickHandler(event)"  label.PRIMARY="l"/>
             <s:Button x="481" y="91" label=":" height="43" width="44"  fontSize="24" fontWeight="bold" click="keyboard_clickHandler(event)"  label.PRIMARY=";"/>
             <s:Button x="525" y="91" label="&quot;" height="43"  width="44" fontSize="24" fontWeight="bold"  click="keyboard_clickHandler(event)" label.PRIMARY="'"/>
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             <s:Button x="111" y="134" label="Z" height="43" width="44"  fontSize="24" fontWeight="bold" click="keyboard_clickHandler(event)"  label.PRIMARY="z"/>
             <s:Button x="155" y="134" label="X" height="43" width="44"  fontSize="24" fontWeight="bold" click="keyboard_clickHandler(event)"  label.PRIMARY="x"/>
             <s:Button x="199" y="134" label="C" height="43" width="44"  fontSize="24" fontWeight="bold" click="keyboard_clickHandler(event)"  label.PRIMARY="c"/>
             <s:Button x="243" y="134" label="V" height="43" width="44"  fontSize="24" fontWeight="bold" click="keyboard_clickHandler(event)"  label.PRIMARY="v"/>
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             <s:Button x="331" y="134" label="N" height="43" width="44"  fontSize="24" fontWeight="bold" click="keyboard_clickHandler(event)"  label.PRIMARY="n"/>
             <s:Button x="375" y="134" label="M" height="43" width="44"  fontSize="24" fontWeight="bold" click="keyboard_clickHandler(event)"  label.PRIMARY="m"/>
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             <s:Button x="463" y="134" label="&gt;" height="43"  width="44" fontSize="24" fontWeight="bold"  click="keyboard_clickHandler(event)" label.PRIMARY="."/>
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