Backslash remove

Hello

I tried to start FCKeditor with some default value which contains backslash, but FCKeditor seems to remove it. I tried PHP addslashes but still to no good. I know it's not a problem with magic quote because I just embed the default value into the same page something like...

$default_html = "Test \ Test";
   $tpl->setVariable('htmlMessage', '<script type="text/javascript">
                     var oFCKeditor = new FCKeditor("editor1");
                     oFCKeditor.BasePath = "../editor/";
                     oFCKeditor.Config["AutoDetectLanguage"] = false ;
                     oFCKeditor.Width = "90%" ;
                     oFCKeditor.Height = "320" ;
                     oFCKeditor.Config["DefaultLanguage"]    = "'.$editor_lang.'" ;
                     oFCKeditor.Value = \''.$default_html.'\';
                     oFCKeditor.Create();
                     </script>');

Help?

Thanks a lot.