Can JavaScript memoization only be used to cache returned results?

I've created the function below, which will run on every page of my site. It runs fast enough but as it runs on every page, it seems to be a good candidate for being cached, maybe using memoization. In my research on the subject, memoization always caches the results that are being sent out with a return statement. This makes perfect sense but as my function isn't returning anything, I'm wondering if it can still be cached? Using something other than memoization perhaps?

Here's my function:

// A requirejs module
define(function() {

 var loadMenu,
   cssdisabled,
   testcss,
   currstyle; 

 /*  
  *  Dynamically create a form that looks like this:
  *
  *  <form action="/search.html" id="js-searchbox" class="form">
  *    <input type="text" name="q" id="tipue_search_input"
  *     placeholder="Search...">
  *    <input type="submit" id="tipue_search_button" value="Search">
  *  </form>
  */
 loadMenu = function() {
   var loadBox = document.getElementById("searchbox"),
     footerBox = document.getElementById("search-about-column"),
     frag = document.createDocumentFragment(),
     form = document.createElement("form"),
     searchTextBox = document.createElement("input"),
     searchButton = document.createElement("input");

 // set attributes for form
 form.action = "/search.html";
 form.setAttribute("role", "search");
 form.id = "js-searchbox";
 form.setAttribute("class", "form");

 // set attributes for Search text box
 searchTextBox.type = "text";
 searchTextBox.name = "q";
 searchTextBox.id = "tipue_search_input";
 searchTextBox.placeholder = "Search...";

 // set attributes for Submit button
 searchButton.type = "submit";
 searchButton.setAttribute("class", "btnSearch");
 searchButton.value = "Search";

 // Arrange elements
 form.appendChild(searchTextBox);
 form.appendChild(searchButton);

 // Load arranged elements into document fragment
 frag.appendChild(form);

 // Load document fragment into #searchbox, which is already on the page
 loadBox.appendChild(frag);
}

 cssdisabled = false;

 testcss = document.createElement('div');

 testcss.style.position = 'absolute';

 document.getElementsByTagName('body')[0].appendChild(testcss);

 if (testcss.currentStyle) {
   currstyle = testcss.currentStyle['position'];
 }

 else if (window.getComputedStyle) {
  currstyle = document.defaultView.getComputedStyle(testcss, null).getPropertyValue('position');
} 

 cssdisabled = (currstyle === 'static') ? true : false;

 document.getElementsByTagName('body')[0].removeChild(testcss);

 if (cssdisabled === false) {
   loadMenu();
 } else {
   return false;
  }

 });