guys how can i get this captcha with randomized name, into my picture box ?!

HTML Code:
<div id="captchaDiv" class="ymemformfield" >
                    <input type="text" name="cword" id="cword" value="" size="10" maxlength="10" class="" tabindex="20" autocomplete="off">
                    <a id="captchaSwitchButton" ><input type="button" tabindex="21" id="caswitchurl" value="Need audio assistance?"></a>
                    <span class="small"><a href="" id="lnk_captcha_moreinfo" title="More info about verifying your account" target="pp">More infohttp://l.yimg.com/us.yimg.com/i/nt/ic/ut/alt1/hlp12_1.gif</a></span>
                    <p>This helps Yahoo! prevent automated registrations.</p>
                    <div id="captchaCanvas" >
                         <noscript>
                               <img src="https://ab.login.yahoo.com/img/iacu2OJZFel04sMMoRc33YK6ojMmTtxajmRALhfdJbKBwdLdLM4o6S3Zm6b1rvHH6cag8k7_r5NW93sCUl9PADBZculf4ceMF55I.jpg" width="290" height="80" alt="" border="2" id="cimg" class="cimg">
                         </noscript>
                         <a id="captchaRefreshAnchor"><input type="button" tabindex="22" id="captchaShuffleLink" value="Try a new code" ></a>
                    </div>
               </div>

               </div>