allora potresti fare due cose, caricare semplicemente un'immagine come questa nel logo a sin:
 
chiaramente devi alterare le dimensioni del logo da PCA 
oppure rapido rapido ho provato a dare una modificatina  all'Header 
e giusto per vedere come va in quanto i parametri si incrociano sempre con quelli del CSS bisogna vedere se e come  lo digerisce  
  
devi caricare questa immagine:
 
a questo url: 
http://sniper5.altervista.org/forum/sty ... goffti.jpg 
logicamente quando salvi l'immagine rinominala uguale (logoffti.jpg) 
salvati il vecchio script, e riprovati il nuovo,  vediamo se nn fa errori o non sfarfalla troppo...in caso di problemi rimetti lo script vecchio pari pari....... nel caso non vada nella giornata di venerdi mi carico un phpbb3 in locale e ti rifaccio subsilver provandolo ok??  
lo script è questo: ricordati sempre di azzerare la cache dopo le modifiche...
Codice: Seleziona tutto
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" dir="{S_CONTENT_DIRECTION}" lang="{S_USER_LANG}" xml:lang="{S_USER_LANG}">
<head>
<meta http-equiv="content-type" content="text/html; charset={S_CONTENT_ENCODING}" />
<meta http-equiv="content-language" content="{S_USER_LANG}" />
<meta http-equiv="content-style-type" content="text/css" />
<meta http-equiv="imagetoolbar" content="no" />
<meta name="resource-type" content="document" />
<meta name="distribution" content="global" />
<meta name="keywords" content="" />
<meta name="description" content="" />
{META}
<title>{SITENAME} • <!-- IF S_IN_MCP -->{L_MCP} • <!-- ELSEIF S_IN_UCP -->{L_UCP} • <!-- ENDIF -->{PAGE_TITLE}</title>
<!-- IF S_ENABLE_FEEDS -->
   <!-- IF S_ENABLE_FEEDS_OVERALL --><link rel="alternate" type="application/atom+xml" title="{L_FEED} - {SITENAME}" href="{U_FEED}" /><!-- ENDIF -->
   <!-- IF S_ENABLE_FEEDS_NEWS --><link rel="alternate" type="application/atom+xml" title="{L_FEED} - {L_FEED_NEWS}" href="{U_FEED}?mode=news" /><!-- ENDIF -->
   <!-- IF S_ENABLE_FEEDS_FORUMS --><link rel="alternate" type="application/atom+xml" title="{L_FEED} - {L_ALL_FORUMS}" href="{U_FEED}?mode=forums" /><!-- ENDIF -->
   <!-- IF S_ENABLE_FEEDS_TOPICS --><link rel="alternate" type="application/atom+xml" title="{L_FEED} - {L_FEED_TOPICS_NEW}" href="{U_FEED}?mode=topics" /><!-- ENDIF -->
   <!-- IF S_ENABLE_FEEDS_TOPICS_ACTIVE --><link rel="alternate" type="application/atom+xml" title="{L_FEED} - {L_FEED_TOPICS_ACTIVE}" href="{U_FEED}?mode=topics_active" /><!-- ENDIF -->
   <!-- IF S_ENABLE_FEEDS_FORUM and S_FORUM_ID --><link rel="alternate" type="application/atom+xml" title="{L_FEED} - {L_FORUM} - {FORUM_NAME}" href="{U_FEED}?f={S_FORUM_ID}" /><!-- ENDIF -->
   <!-- IF S_ENABLE_FEEDS_TOPIC and S_TOPIC_ID --><link rel="alternate" type="application/atom+xml" title="{L_FEED} - {L_TOPIC} - {TOPIC_TITLE}" href="{U_FEED}?f={S_FORUM_ID}&t={S_TOPIC_ID}" /><!-- ENDIF -->
<!-- ENDIF -->
<link rel="stylesheet" href="{T_STYLESHEET_LINK}" type="text/css" />
<script type="text/javascript">
// <![CDATA[
<!-- IF S_USER_PM_POPUP and S_NEW_PM -->
   popup('{UA_POPUP_PM}', 400, 225, '_phpbbprivmsg');
<!-- ENDIF -->
function popup(url, width, height, name)
{
   if (!name)
   {
      name = '_popup';
   }
   window.open(url.replace(/&/g, '&'), name, 'height=' + height + ',resizable=yes,scrollbars=yes,width=' + width);
   return false;
}
function jumpto()
{
   var page = prompt('{LA_JUMP_PAGE}:', '{ON_PAGE}');
   var per_page = '{PER_PAGE}';
   var base_url = '{A_BASE_URL}';
   if (page !== null && !isNaN(page) && page == Math.floor(page) && page > 0)
   {
      if (base_url.indexOf('?') == -1)
      {
         document.location.href = base_url + '?start=' + ((page - 1) * per_page);
      }
      else
      {
         document.location.href = base_url.replace(/&/g, '&') + '&start=' + ((page - 1) * per_page);
      }
   }
}
/**
* Find a member
*/
function find_username(url)
{
   popup(url, 760, 570, '_usersearch');
   return false;
}
/**
* Mark/unmark checklist
* id = ID of parent container, name = name prefix, state = state [true/false]
*/
function marklist(id, name, state)
{
   var parent = document.getElementById(id);
   if (!parent)
   {
      eval('parent = document.' + id);
   }
   if (!parent)
   {
      return;
   }
   var rb = parent.getElementsByTagName('input');
   
   for (var r = 0; r < rb.length; r++)
   {
      if (rb[r].name.substr(0, name.length) == name)
      {
         rb[r].checked = state;
      }
   }
}
<!-- IF ._file -->
   /**
   * Play quicktime file by determining it's width/height
   * from the displayed rectangle area
   *
   * Only defined if there is a file block present.
   */
   function play_qt_file(obj)
   {
      var rectangle = obj.GetRectangle();
      if (rectangle)
      {
         rectangle = rectangle.split(',')
         var x1 = parseInt(rectangle[0]);
         var x2 = parseInt(rectangle[2]);
         var y1 = parseInt(rectangle[1]);
         var y2 = parseInt(rectangle[3]);
         var width = (x1 < 0) ? (x1 * -1) + x2 : x2 - x1;
         var height = (y1 < 0) ? (y1 * -1) + y2 : y2 - y1;
      }
      else
      {
         var width = 200;
         var height = 0;
      }
      obj.width = width;
      obj.height = height + 16;
      obj.SetControllerVisible(true);
      obj.Play();
   }
<!-- ENDIF -->
// ]]>
</script>
</head>
<script type="text/javascript">
//<![CDATA[
document.write('<s'+'cript type="text/javascript" src="http://ad.altervista.org/js.ad/size=728X90/r='+new Date().getTime()+'"><\/s'+'cript>');
//]]>
</script>
<body class="{S_CONTENT_DIRECTION}">
<a name="top"></a>
<div id="wrapheader">
   <div id="logodesc">
      <table width="100%" cellspacing="0">
      <tr>
         <td><a href="{U_INDEX}">{SITE_LOGO_IMG}</a></td>
         <td width="100%" align="center"><h1 align="justify">{SITENAME}<img border="0" src="http://sniper5.altervista.org/forum/styles/subsilver2/imageset/logoffti.jpg" align="right"></h1>
			<p align="justify"><span class="gen"><font size="6">{SITE_DESCRIPTION}<br>      
			</font>      </span>
      	</p>
			<p align="justify"><span class="gen"><big>
			<a
 style="font-weight: bold;"
 href="../portale/index.php"><font size="6">Home
Portale</font></a></big></span><span class="gen"></span></td>
    </tr>
      </table>
   </div>
   <div id="menubar">
      <table width="100%" cellspacing="0">
      <tr>
         <td class="genmed">
            <!-- IF not S_IS_BOT --><a href="{U_LOGIN_LOGOUT}"><img src="{T_THEME_PATH}/images/icon_mini_login.gif" width="12" height="13" alt="*" /> {L_LOGIN_LOGOUT}</a> <!-- ENDIF -->
            <!-- IF U_RESTORE_PERMISSIONS -->  <a href="{U_RESTORE_PERMISSIONS}"><img src="{T_THEME_PATH}/images/icon_mini_login.gif" width="12" height="13" alt="*" /> {L_RESTORE_PERMISSIONS}</a><!-- ENDIF -->
            <!-- IF S_BOARD_DISABLED and S_USER_LOGGED_IN -->  <span style="color: red;">{L_BOARD_DISABLED}</span><!-- ENDIF -->
            <!-- IF not S_IS_BOT -->
               <!-- IF S_USER_LOGGED_IN -->
                  <!-- IF S_DISPLAY_PM -->  <a href="{U_PRIVATEMSGS}"><img src="{T_THEME_PATH}/images/icon_mini_message.gif" width="12" height="13" alt="*" /> {PRIVATE_MESSAGE_INFO}<!-- IF PRIVATE_MESSAGE_INFO_UNREAD -->, {PRIVATE_MESSAGE_INFO_UNREAD}<!-- ENDIF --></a><!-- ENDIF -->
               <!-- ELSEIF S_REGISTER_ENABLED and not (S_SHOW_COPPA or S_REGISTRATION) -->  <a href="{U_REGISTER}"><img src="{T_THEME_PATH}/images/icon_mini_register.gif" width="12" height="13" alt="*" /> {L_REGISTER}</a>
               <!-- ENDIF -->
            <!-- ENDIF -->
         </td>
         <td class="genmed" align="{S_CONTENT_FLOW_END}">
            <a href="{U_FAQ}"><img src="{T_THEME_PATH}/images/icon_mini_faq.gif" width="12" height="13" alt="*" /> {L_FAQ}</a>
            <!-- IF S_DISPLAY_SEARCH -->   <a href="{U_SEARCH}"><img src="{T_THEME_PATH}/images/icon_mini_search.gif" width="12" height="13" alt="*" /> {L_SEARCH}</a><!-- ENDIF -->
            <!-- IF not S_IS_BOT -->
               <!-- IF S_DISPLAY_MEMBERLIST -->   <a href="{U_MEMBERLIST}"><img src="{T_THEME_PATH}/images/icon_mini_members.gif" width="12" height="13" alt="*" /> {L_MEMBERLIST}</a><!-- ENDIF -->
               <!-- IF S_USER_LOGGED_IN -->   <a href="{U_PROFILE}"><img src="{T_THEME_PATH}/images/icon_mini_profile.gif" width="12" height="13" alt="*" /> {L_PROFILE}</a><!-- ENDIF -->
            <!-- ENDIF -->
         </td>
      </tr>
      </table>
   </div>
   <div id="datebar">
      <table width="100%" cellspacing="0">
      <tr>
         <td class="gensmall"><!-- IF S_USER_LOGGED_IN -->{LAST_VISIT_DATE}<!-- ENDIF --></td>
         <td class="gensmall" align="{S_CONTENT_FLOW_END}">{CURRENT_TIME}<br /></td>
      </tr>
      </table>
   </div>
</div>
<div id="wrapcentre">
   <!-- IF S_DISPLAY_SEARCH -->
   <p class="searchbar">
      <span style="float: {S_CONTENT_FLOW_BEGIN};"><a href="{U_SEARCH_UNANSWERED}">{L_SEARCH_UNANSWERED}</a> | <a href="{U_SEARCH_ACTIVE_TOPICS}">{L_SEARCH_ACTIVE_TOPICS}</a></span>
      <!-- IF S_USER_LOGGED_IN or S_LOAD_UNREADS -->
      <span style="float: {S_CONTENT_FLOW_END};"><!-- IF S_LOAD_UNREADS --><a href="{U_SEARCH_UNREAD}">{L_SEARCH_UNREAD}</a><!-- IF S_USER_LOGGED_IN --> | <!-- ENDIF --><!-- ENDIF --><!-- IF S_USER_LOGGED_IN --><a href="{U_SEARCH_NEW}">{L_SEARCH_NEW}</a> | <a href="{U_SEARCH_SELF}">{L_SEARCH_SELF}</a><!-- ENDIF --></span>
      <!-- ENDIF -->
   </p>
   <!-- ENDIF -->
   <br style="clear: both;" />
   <!-- INCLUDE breadcrumbs.html -->
   <br />