inapp-query-param.js

  /*
  * Helper function for getting query string parameters
  * @param {string} name The name of the query parameter we want the value of
  * @return {string} results Value of the query parameter
  */
    function getParameterByName(name) {
        name = name.replace(/[\[]/, "\\\[").replace(/[\]]/, "\\\]");
        var regex = new RegExp("[\\?&]" + name + "=([^&#]*)"),
            results = regex.exec(location.search);
        return results == null ? "" : decodeURIComponent(results[1].replace(/\+/g, " "));
    }
    
    /* Hide the masthead if we are in an NYT app */
    var qParam = getParameterByName("nytapp");
    if (qParam) { 
        $("#masthead").hide(); // or whatever you want to do here. some people add a class to the html or body tag to hide stuff with CSS
    }