title: TinyMCE extended_valid_elements doesn't seem to do it
body: <p>I want TinyMCE to allow attributes like <strong>style</strong> and <strong>class</strong> on images but i can't really get it to work. I've read through the documentation, as well as on the net but can't find a solution.</p>
  
  <p>The problem is that the 'extended_valid_elements' command doesn't do the job. Everytime I press "save" in the editor it just ignores the <strong>style</strong> and <strong>class</strong> attribute. I just wonder if someone has had the same problem?</p>
  
  <p>I have a TinyMCE setup that looks like following (Everything works fine, but not the <strong>extended_valid_elements</strong>) :</p>
  
  <pre><code>$('textarea.editor').tinymce({
      // Location of TinyMCE script
      script_url : '/assets/js/tiny_mce/tiny_mce.js',
      height : 400,
      width : 665,
  
      extended_valid_elements : "img[class|src|border=0|alt|title|hspace|vspace|width|height|align|onmouseover|onmouseout|name|style]",
  
      // General options
      theme : "advanced",
      plugins : "pagebreak,style,layer,table,save,advhr,advimage,advlink,emotions,iespell,inlinepopups,insertdatetime,preview,media,searchreplace,print,contextmenu,paste,directionality,fullscreen,noneditable,visualchars,nonbreaking,xhtmlxtras,template,imagemanager",
  
      // Theme options
      theme_advanced_buttons1 : "save,newdocument,|,bold,italic,underline,strikethrough,|,justifyleft,justifycenter,justifyright,justifyfull,styleselect,formatselect,fontselect,fontsizeselect",
      theme_advanced_buttons2 : "cut,copy,paste,pastetext,pasteword,|,search,replace,|,bullist,numlist,|,outdent,indent,blockquote,|,undo,redo,|,link,unlink,anchor,image,cleanup,help,code,|,insertdate,inserttime,preview,|,forecolor,backcolor",
      theme_advanced_buttons3 : "tablecontrols,|,hr,removeformat,visualaid,|,sub,sup,|,charmap,emotions,iespell,media,advhr,|,print,|,ltr,rtl,|,fullscreen",
      theme_advanced_buttons4 : "insertlayer,moveforward,movebackward,absolute,|,styleprops,|,cite,abbr,acronym,del,ins,attribs,|,visualchars,nonbreaking,template,pagebreak,insertimage",
      theme_advanced_toolbar_location : "top",
      theme_advanced_toolbar_align : "left",
      theme_advanced_statusbar_location : "bottom",
      theme_advanced_resizing : true,
  
      relative_urls : false,
      skin : "o2k7",
      skin_variant : "silver",
  
      // Example content CSS (should be your site CSS)
      //content_css : "/assets/css/styles-common.css",
  
      // Drop lists for link/image/media/template dialogs
      template_external_list_url : "lists/template_list.js",
      external_link_list_url : "lists/link_list.js",
      external_image_list_url : "lists/image_list.js",
      media_external_list_url : "lists/media_list.js",
  
      // Replace values for the template plugin
      template_replace_values : {
          username : "Some User",
          staffid : "991234"
      }
  });
  </code></pre>
  
  <p>Thank you!</p>
  
  <p>/Jens</p>