var account_domain = "derekmarkham.tweetfunnel.com";

//var account_domain = 'nextstep.mediafunnel.dev:3000'; 

document.write('<iframe style="width:250px; height: 200px; overflow: hidden; padding:0; margin:0;" ' 
    +' frameborder="0" scrolling="no" id="guest_frame" name="guest_frame" ' 
    +' src="http://'
    +account_domain
    +'\/guest_posts/new\/' 
    +guest_key
    + '" <\/iframe>');