Ciao a tutti voi. 
Grazie al forum GT ho scoperto Joomla e subito è stata passione. 
Magari in altro post potrò raccontare come andarono le cose, fatto sta che ora non posso più veramente farne a meno. 
Bando alle ciance, vengo al mio problema.
Io avrei terminato il mio sito, l'unica cosa che ancora non ho capito come si fa è la sostituzione nel template del file .png con un file .swf.
Riepilogo: template utilizzato dj-0013 che presenta il seguente codice nel file index.php:
[html]<?php
/*--------------------------------------------------------------
December 2008 (for Joomla 1.5)
Copyright (C) design-joomla.eu All Rights Reserved.
License: Copyrighted Commercial Software
Website:
Support:
---------------------------------------------------------------*/
defined( 'JEXEC' ) or die( 'Restricted access' );
$url = clone(JURI::getInstance());
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" " ">
<html xmlns=" "> xml:lang="<?php echo $this->language; ?>" lang="<?php echo $this->language; ?>" >
<head>
<jdoc:include type="head" />
<?php
require( "templates/".$this->template . "/menu.php");
require( "templates/".$this->template . "/cssloader.php");?>
<link rel="stylesheet" href="<?php echo $this->baseurl ?>/templates/<?php echo $this->template ?>/css/editor.css" type="text/css" />
<link rel="stylesheet" href="<?php echo $this->baseurl ?>/templates/<?php echo $this->template ?>/css/template<?php echo $font_color;?>.css" type="text/css" />
<link rel="stylesheet" href="<?php echo $this->baseurl ?>/templates/<?php echo $this->template ?>/favicon.ico"/>
<link rel="stylesheet" href="<?php echo $this->baseurl ?>/templates/<?php echo $this->template ?>/css/general_<?php echo $font_color;?>.css" type="text/css" />
<link href="<?php echo $this->baseurl ?>/templates/<?php echo $this->template?>/css/horizontal_<?php echo $font_color;?>.css" rel="stylesheet" type="text/css"/>
<script language="javascript" src="<?php echo $this->baseurl ?>/templates/<?php echo $this->template ?>/js/animation.js" type="text/javascript"></script>
<script language="javascript" src="<?php echo $this->baseurl ?>/templates/<?php echo $this->template ?>/js/cssmenus.js" type="text/javascript"></script>
<!--[if lte IE 6]>
<link href="<?php echo $this->baseurl ?>/templates/<?php echo $this->template ?>/css/ieonly.css" rel="stylesheet" type="text/css" />
<![endif]-->
<?php
if($this->countModules('left and right') == 0) $contentwidth = "100";
if($this->countModules('left or right') == 1) $contentwidth = "80";
if($this->countModules('left and right') == 1) $contentwidth = "60";
?>
<!--<?php
if($this->get('template_width') == 0) { ?>
<style type="text/css"> #wrap {width:960px;} </style>
<?php } ?>
<?php
if($this->get('template_width') == 1) { ?>
<style type="text/css"> {width:960px;} </style>
<?php } ?>
<?php
if($this->get('template_width') == 2) { ?>
<style type="text/css"> {min-width:760px;max-width:960px;width: auto !important;width:960px;} </style>
<?php } ?>-->
</head>
<body class="<?php echo $font_s; ?>">
<div id="all" align="center">
<div id="wrap<?php echo "_".$width; ?>">
<div id="logo_search" class="clearfix">
<div id="logo"><a href="index.php"><img src="<?php echo $this->baseurl ?>/templates/<?php echo $this->template ?>/images/logo.jpg" alt="home" border="0"/></a></div>
<div id="search">
<jdoc:include type="modules" name="user4"/>
</div>
</div>
<div id="topmenu_icons" class="clearfix">
<div id="icons">
<a href="<?php echo $this->baseurl ?>/templates/<?php echo $this->template ?>/csschanger.php?width=narrow" title="Narrow width"><img src="<?php echo $this->baseurl ?>/templates/<?php echo $this->template?>/images/narrow.gif" alt="n" border="0"/></a>
<a href="<?php echo $this->baseurl ?>/templates/<?php echo $this->template ?>/csschanger.php?width=wide" title="Wide width"><img src="<?php echo $this->baseurl ?>/templates/<?php echo $this->template ?>/images/wide.gif" alt="w" border="0"/></a>
<a href="<?php echo $this->baseurl ?>/templates/<?php echo $this->template ?>/csschanger.php?font_color=green" title="Wide width"><img src="<?php echo $this->baseurl ?>/templates/<?php echo $this->template ?>/images/green.gif" alt="w" border="0"/></a>
<a href="<?php echo $this->baseurl ?>/templates/<?php echo $this->template ?>/csschanger.php?font_color=default" title="Wide width"><img src="<?php echo $this->baseurl ?>/templates/<?php echo $this->template ?>/images/blue.gif" alt="w" border="0"/></a>
<a href="<?php echo $this->baseurl ?>/templates/<?php echo $this->template ?>/csschanger.php?font_color=orange" title="Wide width"><img src="<?php echo $this->baseurl ?>/templates/<?php echo $this->template ?>/images/orange.gif" alt="w" border="0"/></a>
<a href="<?php echo $this->baseurl ?>/templates/<?php echo $this->template ?>/csschanger.php?font_color=red" title="Wide width"><img src="<?php echo $this->baseurl ?>/templates/<?php echo $this->template ?>/images/red.gif" alt="w" border="0"/></a>
</div>
<div align="right">
<div id="topmenu"><?php mosShowListMenu('topmenu');?></div>
</div>
</div>
<div id="baner">
<?php if($this->countModules('advert1')) { ?>
<jdoc:include type="module" name="advert1" style="xhtml" />
<?php } else{ ?>
<img src="<?php echo $this->baseurl ?>/templates/<?php echo $this->template ?>/images/baner.jpg" alt="baner" border="0"/>
<?php }?>
<?php if($this->countModules('advert2')) : ?>
<div id="baner_module">
<jdoc:include type="modules" name="advert2" />
</div>
<?php endif; ?>
</div>
<div id="path_fonts" class="clearfix">
<div id="path">You are here:
<jdoc:include type="module" name="breadcrumbs" />
</div>
<div id="fonts">
<a href="<?php echo $this->baseurl ?>/templates/<?php echo $this->template ?>/csschanger.php?font_s=large" title="Font size"><img src="<?php echo $this->baseurl ?>/templates/<?php echo $this->template ?>/images/<?php echo $font_color;?>/big_font.gif" alt="large" border="0"/></a>
<a href="<?php echo $this->baseurl ?>/templates/<?php echo $this->template ?>/csschanger.php?font_s=smaller" title="Font size"><img src="<?php echo $this->baseurl ?>/templates/<?php echo $this->template ?>/images/<?php echo $font_color;?>/small_font.gif" alt="small" border="0"/></a>
<a href="<?php echo $this->baseurl ?>/templates/<?php echo $this->template ?>/csschanger.php?font_s=default" title="Font size"><img src="<?php echo $this->baseurl ?>/templates/<?php echo $this->template ?>/images/<?php echo $font_color;?>/default_font.gif" alt="default" border="0"/></a>
</div>
</div>
<div id="contener" class="clearfix">
<?php if($this->countModules('left')) : ?>
<div id="sidebar">
<jdoc:include type="modules" name="left" style="xhtml" />
</div>
<?php endif; ?>
<div id="content<?php echo $contentwidth; ?>">
<div class="inside">
<jdoc:include type="message" />
<jdoc:include type="component" style="xhtml" />
</div>
</div>
<?php if($this->countModules('right')) : ?>
<div id="sidebar-2">
<jdoc:include type="modules" name="right" style="xhtml" />
</div>
<?php endif; ?>
</div>
<div id="footer" class="clearfix">
<div id="xhtml_css">
Powered by <b>Joomla!</b>. <a href="" ">" target="_blank" title="Joomla templates">Joomla Templates - Design-Joomla.eu</a> Valid <a href="" "></a> and
<a href="" "> echo $url->toString();?>">CSS</a> </div>
<div id="rss"><jdoc:include type="modules" name="syndicate" /></div>
</div>
</div>
<!--end of wrap-->
</div>
</body>
</html>[/html]
La domanda che pongo è: e poi? cosa devo fare per sostituire l'immagine nell'header denominata baner.png?
Grazie anticipato a tutti.
Non vorrei procedere ad un nuovo cambio. E' per questo che vorrei togliere il widget dalla sidebar e spostare il tutto sul login 
