please add a snippets forum to post and find code easily

CKEDITOR.addStylesSet('MAstyle',[
{name:'h1',element:'h1'},
{name:'h2',element:'h2'},
{name:'h3',element:'h3'}
]);
CKEDITOR.config.toolbar_Minimal=[ ['Source','Bold','Italic','Underline'] ];

CKEDITOR.replace( '".$id."',
            {
            stylesCombo_stylesSet: 'MAstyle'
            });

</script>

<script language="JavaScript" src="./editor/ckeditor/ckeditor.js"></script>
      <script language="JavaScript">


CKEDITOR.addStylesSet('miei_stili',[{ name: 'Immagine a sinistra' , element: 'img', attributes: { 'style': 'padding: 5px; margin-right: 5px; float:left;display:inline;border: 0px solid #000000;position:relative;' } } ,{ name: 'Immagine a destra' , element: 'img', attributes: { 'style': 'padding: 5px; margin-left: 5px; float:right;display:inline;border: 0px solid #000000;position:relative;' } } ,{ name: 'Immagine con bordo nero' , element: 'img', attributes: { 'style': 'border: 1px solid #000000;' } } ,{ name: 'Immagine senza bordo' , element: 'img', attributes: { 'style': 'border: 0px solid #000000;' } }]);


                    CKEDITOR.replace( 'contenuto',
                  {
                     stylesCombo_stylesSet: 'miei_stili'
                  });

                

                                                </script>   

This is very weird as your code works fine for me. I added an image, and when I selected the styles (with the image selected) it showed me the four options and when I selected them it moved the image around the editable area. And when I selected the styles without an image selected it showed me nothing in the style dropdown as to be expected.

Can you give me more information on how it wasn't working for you?

Using the _samples/replacebycode.html page as my base.

I inserted

            <textarea cols="80" id="editor1" name="editor1" rows="10">&lt;p&gt;This is some &lt;strong&gt;sample text&lt;/strong&gt;. You are using &lt;a href="http://www.fckeditor.net/"&gt;CKEditor&lt;/a&gt;.&lt;/p&gt;</textarea>
            <script type="text/javascript">
            //<![CDATA[
            CKEDITOR.addStylesSet('miei_stili',[{ name: 'Immagine a sinistra' , element: 'img', attributes: { 'style': 'padding: 5px; margin-right: 5px; float:left;display:inline;border: 0px solid #000000;position:relative;' } } ,{ name: 'Immagine a destra' , element: 'img', attributes: { 'style': 'padding: 5px; margin-left: 5px; float:right;display:inline;border: 0px solid #000000;position:relative;' } } ,{ name: 'Immagine con bordo nero' , element: 'img', attributes: { 'style': 'border: 1px solid #000000;' } } ,{ name: 'Immagine senza bordo' , element: 'img', attributes: { 'style': 'border: 0px solid #000000;' } }]);
               
               CKEDITOR.replace( 'editor1',
            {   
               stylesCombo_stylesSet: 'miei_stili'
            });
            //]]>
            </script>

I resolved my problems.
I did't see the elements in the drop-down menu because I did't select any image... O_O

Now I have another problems.
For 'Blocks Stiles' I see them, but I can't see the preview in the drop-down and when I apply the style, the editor don't show the style.

I have the styles in a css file that I include in the page.

This is the code

$this->output = "CKEDITOR.addStylesSet('stili_editor',[";

//builds styles from a php array $stili

        if (is_array($stili) and count($stili)!= 0) {
            foreach ($stili as $stile) {
                $this->output .= "{ name: '".$stile['nome']."' , element: 'div', attributes: { 'class': 'classEditor".$stile['id']."' } } ,";
            }
        }