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