need to modify php mail form

[thornhillguy]

$data_email_sender =  new FM_FormDataSender(sfm_readfile("./templ/orderform_email_subj.txt"),sfm_readfile("./templ/orderform_email_body.txt"),"%Email%");
$data_email_sender->AddToAddr("recipient one<person@home.com>");
$data_email_sender->AddToAddr("recipient two<person@home.com>");
//-----Added Sample Code Start---------
if(isset($_POST['sfm_form_submitted']))
{
    if($_POST['store'] == 'Queen')
    {
        $data_email_sender->AddToAddr("recipient three<person@home.com>");
    }
    elseif($_POST['store'] == 'Disera')
    {
        $data_email_sender->AddToAddr("recipient four<person@home.com>");
    }
    elseif($_POST['store'] == 'Wilson')
    {
        $data_email_sender->AddToAddr("recipient five<person@home.com>");
    }
}
//-----Added Sample Code End ---------  


From the orderform-lib.php




////////FormDataSender/////////////
class FM_FormDataSender extends FM_ComposedMailSender
{
    var $mail_subject;
    var $mail_template;
    var $dest_list;
    var $mail_from;
    var $file_upload;
    var $attach_files;
    function FM_FormDataSender($subj="",$templ="",$from="")
    {
        $this->mail_subject=$subj;
        $this->mail_template=$templ;
        $this->dest_list=array();
        $this->mail_from=$from;
        $this->file_upload=NULL;
        $this->attach_files = true;
    }
   
    function SetFileUploader(&$fileUploader)
    {
        $this->file_upload = &$fileUploader;
    }

    function AddToAddr($toaddr)
    {
        array_push($this->dest_list,$toaddr);
    }
   
    function SetAttachFiles($attach_files)
    {
        $this->attach_files = $attach_files;
    }

    function SendFormData()
    {
        $this->InitMailer();

        $this->ComposeMessage($this->mail_subject,
                    $this->mail_template);

        if($this->attach_files && NULL != $this->file_upload )
        {
            $this->file_upload->AttachFiles($this->mailer);
        }

        $from_merge = new FM_PageMerger();
        $from_merge->Merge($this->mail_from,$this->formvars);
        $this->mail_from = $from_merge->getMessageBody();
                   
        foreach($this->dest_list as $to_address)
        {
            $this->logger->LogInfo("sending form data to: $to_address");
            $this->SendMail($this->mail_from,
                    $to_address);
        }       
    }

    function Process(&$continue)
    {
        if(strlen($this->mail_template)<=0||
           count($this->dest_list)<=0)
        {
            return false;
        }
        $continue = true;
        $this->SendFormData();
        return true;
    }
}