Help with cURL script for yahoo login

i am new to curl .and i m trying to create create a script to log into yahoo and click the confermation link in emails.
but i am stuck witht he login process only
i made the code below . but still i cant make it work. the problem is yahoo is implementing a captcha challange for this kind of automated headers. do you have any idea ho to make it work again without alerting the captcha challange ?

the header i caught through the livehttp header is as follows:

Content-Length: 347
.tries=1&.src=ym&.md5=&.hash=&.js=&.last=&promo=&.intl=in&.bypass=&.partner=&.u=4ls6cr96lbs8e&.v=0&.challenge=W9w31pCrbdazCcY4mH41fVsyxwd8&.yplus=&.emailCode=&pkg=&stepid=&.ev=&hasMsgr=0&.chkP=Y&.done=http%3A%2F%2Fmail.yahoo.com&.pd=ym_ver%3D0%26c%3D%26ivt%3D%26sg%3D&pad=1&aad=1&login=myyahooid&passwd=mypassword&.persistent=y&.save=&passwd_raw=

PHP Code:

<?php $authUrl = "https: //login. yahoo . com/config/login?"; $userAgent = "Mozilla/5.0 (Windows NT 5.1; rv:2.0b11) Gecko/20100101 Firefox/4.0b11"; $referer = "http : // my . yahoo . com"; $login = "userid"; $password = "password"; $numPostData = 22; $cookieFileJar = "ycookie.txt"; $cookie = 0; $postData = ".tries=1&.src=ym&.md5=&.hash=&.js=&.last=&promo=&.intl=in&.bypass=&.partner=&.u=4ls6cr96lbs8e&.v=0&.challenge=W9w31pCrbdazCcY4mH41fVsyxwd8&.yplus=&.emailCode=&pkg=&stepid=&.ev=&hasMsgr=0&.chkP=Y&.done=http%3A%2F%2Fmail.yahoo.com&.pd=ym_ver%3D0%26c%3D%26ivt%3D%26sg%3D&pad=1&aad=1&login=$login&passwd=$password&.persistent=y&.save=&passwd_raw=" ; $ch = curl_init(); curl_setopt($ch, CURLOPT_USERAGENT, $userAgent); // Set the referrer curl_setopt($ch, CURLOPT_REFERER, $referer); // Set the authentication url curl_setopt($ch, CURLOPT_URL, $authUrl); // Set number of post fields curl_setopt($ch, CURLOPT_POST, $numPostData); //Set post data in key=value pair such as login=yourusername curl_setopt($ch, CURLOPT_POSTFIELDS, $numPostData); //Set filename for storing cookie information curl_setopt($ch, CURLOPT_COOKIEJAR, $cookieFileJar); //Set ffilename for checking the stored cookie information curl_setopt($ch, CURLOPT_COOKIEFILE, $cookieFileJar); //Set option for cookie curl_setopt($ch, CURLOPT_COOKIE, $cookie); //set this to output the result as string and not output directly ot browser curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE); //set this value to 1 if you want to redirect to the url you provided as service url curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 0); //Set this option if you do not want to verify ssl curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0); //set this option if you do not want to verify peer's certificate curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0); //now execute the curl $res = curl_exec($ch); echo $res; //check if the username and password is valid if ((preg_match("/invalid/i", $res)) || (preg_match("/not yet taken/i", $res))) { echo "Invalid Login"; } else { //if CURLOPT_FOLLOWLOCATION is set to 1 then after logging in successfully user is directed to url that is specified as service url echo "Logged In"; } ?>

then i have to work for clicking confermation links in mails. please suggest me some ways.i would be very grateful to you :)