doublequotes "escaped" by "\"

Hi,

I have a strange problem that do not appears when I use CKEditor on local files through Easy PHP2.0 but that appears when I use the files hosted through internet (OHV hosting). An exemple will be more easy to understand :

The original text to be modified is "<font color="blue" size="22px">Petit essai</font>" and was uploaded on the server through filezilla in a file of the host server.

Then I load that text in a page with CKEditor. The "source" option of CKEditor displays it righly.

If I send back the text to the server (without any change) to be saved, it is now stored as "<font color=\"blue\" size=\"22px\">Petit essai</font>"
Each double quote has been "escaped" with an "\" character and the result becomes unusuable.

There is nothing special on the text save php script :

  if (isset($_POST['edition']))
  {
    $Fich = fopen($PageHtm, "w");
    fWrite($Fich, $_POST['edition']);
      fclose($Fich);
  }

nor in the CKEdit call PHP script :

  if ($edition)
  {
    echo '<form method="post" action="'.$PagePhp.'">';
    echo '<textarea class="ckeditor" id="edition" name="edition">';
    readfile($PageHtm);
    echo '</textarea>';

    echo '<script type="text/javascript">CKEDITOR.replace(\'edition\', {extraPlugins : \'uicolor\', height: \'600px\',} ); </script>';

    echo '<p><input type="submit" /></p>';
    echo '</form>';
}

Does someone have seen that before ?
Does the problem come from a configuration of CKEditor, or from some setting of the host ?

I have tried many and many things, even to read CKSources... but I still do not understand.
Any help will be welcome before I become crazy !!!

Thank you very much (and please excuse my English)
Pascal