how to find image width and add same with on LI?

how to find image width and add same with on LI?

Hi i'm not developer so need small help. here is what i have got now.

now i need to find image width and add on newly added li that wrap image.
  2. <!DOCTYPE html>
  3. <html>
  4. <head>
  5.   <title></title>
  6.   <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
  7. </head>
  8. <body>
  9.   <nav class="navigation">
  10.     <ul>
  11.      <li class="nav-women">
  12.         <a class="level-top" href="women"><span>women</span></a>
  13.         <ul class="level0">
  14.           <li class="nav-features">
  15.             <a href="women/features"><span>FEATURES</span></a>
  16.             <ul class="level1 ">
  17.               <li class="nav-new-arrivals">
  18.                 <a href="women/features/new-arrivals"><span>New Arrivals</span></a>
  19.               </li>
  20.           </ul>
  21.           </li>
  22.           <li class="nav-categories">
  23.             <a href="women/categories"><span>CATEGORIES</span></a>
  24.             <ul class="level1 submenu sub0">
  25.               <li class="nav-sweaters">
  26.                 <a href="#"><span>Sweaters</span></a>
  27.               </li>            </ul>
  28.           </li>
  29.         </ul>
  30.       </li>
  31.       <li class="nav-mens">
  32.         <a class="level-top" href="mens"><span>mens</span></a>
  33.         <ul class="level0 submenu sub2">
  34.           <li class="nav-features">
  35.             <a href="mens/features"><span>FEATURES</span></a>
  36.             <ul class="level1 submenu sub0">
  37.               <li class="nav-new-arrivals">
  38.                 <a href="mens/features/new-arrivals"><span>New Arrivals</span></a>
  39.               </li>
  40.                          </ul>
  41.           </li>
  42.           <li class="nav-categories">
  43.             <a href="mens/categories"><span>CATEGORIES</span></a>
  44.             <ul class="level1 submenu sub0">
  45.               <li class="nav-bags">
  46.                 <a href="mens/categories/bags"><span>Bags</span></a>
  47.               </li>
  48.               <li class="nav-blazers">
  49.                 <a href="mens/categories/blazers"><span>Blazers</span></a>
  50.               </li>
  51.               <li class="nav-ties">
  52.                 <a href="mens/categories/ties"><span>Ties</span></a>
  53.               </li>
  54.             </ul>
  55.           </li>
  56.         </ul>
  57.       </li>
  58.     </ul>
  59.  </nav>
  60.   <div class="nav-women"><img src="http://images.apple.com/v/home/ct/images/promos/public_betas_medium.jpg"></div>
  61.  <div class="nav-mens"><img src="http://images.apple.com/v/home/ct/images/promos/public_betas_medium.jpg"></div>
  62. <script>
  63.     $(document).ready(function () {
  64.         $("div[class^='nav'] img").each(function (a, b) {                
  65.             var imgTag = $(this).closest("div[class^='nav']").clone(true);
  66.             var parentDivClass = imgTag.attr("class");
  67.             $(this).closest("div[class^='nav']").remove();

  69.             var newHtml = "<li>" + imgTag[0].outerHTML + "</li>";
  70.             $("li[class^=" + parentDivClass + "] ul:first").append(newHtml);
  71.             $("li[class^=" + parentDivClass + "]:first").addClass("newfixedclass");
  72.         }); 
  73.     });
  74. </script>
  75. </body>
  76. </html>