add class to images for the drop shadow effect

gistfile1.js

jQuery(document).ready(function($){

  $('.entry-content img, .wp-caption img').wrap('<div class="drop-shadow" />');
  
   $('.entry-content img').each(function(){
   	var thisWidth = $(this).width();
   	var thisClasses = $(this).attr('class');

   	$(this).removeClass(thisClasses).parent('.drop-shadow').css('width',thisWidth).addClass(thisClasses);
   
   });
    
});