Получить cookies из браузера

function DoLogin()
{
    var form = document.forms['logon'];
    if ( g_bLoginInFlight || form.elements['username'].value.length == 0 || form.elements['password'].value.length == 0 )
        return;
    g_bLoginInFlight = true;
    $('login_btn_signin').hide();
    $('login_btn_wait').show();
    new Ajax.Request( 'https://store.steampowered.com:443/login/getrsakey/',
        {
            method: 'post',
            parameters: {
                username: form.elements['username'].value
            },
            onSuccess: OnRSAKeyResponse,
            onException: function( req, e ) { throw e; }
        }
    );
}

function OnRSAKeyResponse( transport )
{
    var results = transport.responseJSON;
    if ( results.publickey_mod && results.publickey_exp && results.timestamp )
    {
        var form = document.forms['logon'];
 
        var pubKey = RSA.getPublicKey( results.publickey_mod, results.publickey_exp );
        var encryptedPassword = RSA.encrypt( form.elements['password'].value, pubKey );
        new Ajax.Request( 'https://store.steampowered.com:443/login/dologin/',
        {
            method: 'post',
            parameters: {
                username: form.elements['username'].value,
                password: encryptedPassword,
                emailauth: form.elements['emailauth'].value,
                captchagid: form.elements['captchagid'].value,
                captcha_text: form.elements['captcha_text'].value,
                emailsteamid: form.elements['emailsteamid'].value,
                rsatimestamp: results.timestamp,
                remember_login: form.elements['remember_login'] && form.elements['remember_login'].checked
            },
            onSuccess: OnLoginResponse,
            onException: function( req, e ) { throw e; }
        }
        );
    }

var pubKey = RSA.getPublicKey( results.publickey_mod, results.publickey_exp );
var encryptedPassword = RSA.encrypt( form.elements['password'].value, pubKey );

var RSA = {
 
    getPublicKey: function( $modulus_hex, $exponent_hex ) {
        return new RSAPublicKey( $modulus_hex, $exponent_hex );
    },
 
    encrypt: function($data, $pubkey) {
        if (!$pubkey) return false;
        $data = this.pkcs1pad2($data,($pubkey.modulus.bitLength()+7)>>3);
        if(!$data) return false;
        $data = $data.modPowInt($pubkey.encryptionExponent, $pubkey.modulus);
        if(!$data) return false;
        $data = $data.toString(16);
        return Base64.encode(Hex.decode($data));
    },
 
    pkcs1pad2: function($data, $keysize) {
        if($keysize < $data.length + 11)
            return null;
        var $buffer = [];
        var $i = $data.length - 1;
        while($i >= 0 && $keysize > 0)
            $buffer[--$keysize] = $data.charCodeAt($i--);
        $buffer[--$keysize] = 0;
        while($keysize > 2)
            $buffer[--$keysize] = Math.floor(Math.random()*254) + 1;
        $buffer[--$keysize] = 2;
        $buffer[--$keysize] = 0;
        return new BigInteger($buffer);
    }
}