How do get my ajax form to inject captcha verification into the browser after successful form validation?

I would like to have one last step that pulls reCaptcha and when reCaptcha has been passed only then is the registration details of the user sent to my database and user forwarded to what ever page I choose.I would like to have one last step that pulls reCaptcha and when reCaptcha has been passed only then is the registration details of the user sent to my database and user forwarded to what ever page I choose.

Here is my javascript and ajax. The submit.php is a file that holds all my validation rules. I think I now have to have a file that holds my captcha and use ajax to get that file or maybe there is some better way. I’m still learning.

$(document).ready(function(){

        $('#fhjoinForm').submit(function(e) {

            register();
            e.preventDefault();

        });

    });


    function register()
    {
        hideshow('loading',1);
        error(0);

        $.ajax({
            type: "POST",
            url: "submit.php",
            data: $('#fhjoinForm').serialize(),
            dataType: "json",
            success: function(msg){

                if(parseInt(msg.status)==1)
                {
                    window.location=msg.txt;
                }
                else if(parseInt(msg.status)==0)
                {
                    error(1,msg.txt);
                }

                hideshow('loading',0);
            }
        });

    }


    function hideshow(el,act)
    {
        if(act) $('#'+el).css('visibility','visible');
        else $('#'+el).css('visibility','hidden');
    }

    function error(act,txt)
    {
        hideshow('error',act);
        if(txt) $('#error').html(txt);
    }Here is my javascript and ajax. The submit.php is a file that holds all my validation rules. I think I now have to have a file that holds my captcha and use ajax to get that file or maybe there is some better way. I'm still learning. $(document).ready(function(){ $('#fhjoinForm').submit(function(e) { register(); e.preventDefault(); }); }); function register() { hideshow('loading',1); error(0); $.ajax({ type: "POST", url: "submit.php", data: $('#fhjoinForm').serialize(), dataType: "json", success: function(msg){ if(parseInt(msg.status)==1) { window.location=msg.txt; } else if(parseInt(msg.status)==0) { error(1,msg.txt); } hideshow('loading',0); } }); } function hideshow(el,act) { if(act) $('#'+el).css('visibility','visible'); else $('#'+el).css('visibility','hidden'); } function error(act,txt) { hideshow('error',act); if(txt) $('#error').html(txt); }