Stilar

$(document).ready(function(){

    $(".iframe").each(function(){
      var that = $(this);
      that.colorbox({
        iframe:true, innerWidth:"90%", height:"90%",
        onComplete: function() {
            $("#cboxContent iframe").ready(function(){
                $("#cboxContent").append('<a id="cboxFullScr" style="float: left;" href=' + that.attr("href") + '>full screen</a>');
            });
          }
      });
    });

});