ho provato ad inserire il file flash e modificato index.php del template ma mi rimane tutto bianco

index.php
?php
defined( '_JEXEC' ) or die( 'Restricted access' );
JPlugin::loadLanguage( 'tpl_SG1' );
?>
<!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" xml:lang="<?php echo $this->language; ?>" lang="<?php echo $this->language; ?>" >
<head>
<jdoc:include type="head" />
<link rel="stylesheet" href="templates/system/css/system.css" type="text/css" />
<link rel="stylesheet" href="templates/<?php echo $this->template ?>/css/template.css" type="text/css" />
<!--[if lte IE 7]>
<link rel="stylesheet" href="templates/<?php echo $this->template ?>/css/ie6.css" type="text/css" />
<![endif]-->
</head>
<body class="bg">
<div class="menu_bg">
<div id="wrapper">
<div id="header">
<object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000"
codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,40,0"
width="1000" height="270">
<param name="width" value="1000" />
<param name="height" value="270" />
<param name="src" value="templates/siteground-j15-74/images/logo.swf" />
<param name="quality" value="high" />
<embed type="application/x-shockwave-flash" width="1000" height="270"
src="/templates/siteground-j15-74/images/logo.swf" quality="high">
</embed>
</object>
<div id="top_menu">
<table cellspacing="0" cellpadding="0" style="margin:0 auto;">
<tr>
<td>
<div class="top_menu_separator">
<jdoc:include type="modules" name="user3" />
</div>
</td>
</tr>
</table>
<div class="clr"></div>
</div>
<table cellspacing="0" cellpadding="0" class="header_logo">
<tr>
<td>
<div id="logo">
<a href="index.php"><?php echo $mainframe->getCfg('sitename') ;?>[/url]
</div>
</td>
</tr>
</table>
<div id="news_flash">
<jdoc:include type="modules" style="rounded" name="top" />
</div>
</div>
<div id="content">
<div class="content_t">
<?php if($this->countModules('left') and JRequest::getCmd('layout') != 'form') : ?>
<div id="leftcolumn">
<jdoc:include type="modules" name="left" style="rounded" />
<?php $sg = 'banner'; include "templates.php"; ?>
</div>
<?php endif; ?>
<?php if($this->countModules('right') and JRequest::getCmd('layout') != 'form') : ?>
<div id="main">
<?php else: ?>
<div id="main_full">
<?php endif; ?>
<div class="nopad">
<jdoc:include type="message" />
<?php if($this->params->get('showComponent')) : ?>
<jdoc:include type="component" />
<?php endif; ?>
</div>
</div>
<?php if($this->countModules('right') and JRequest::getCmd('layout') != 'form') : ?>
<div id="rightcolumn" style="float:right;">
<jdoc:include type="modules" name="right" style="rounded" />
</div>
<?php endif; ?>
<div class="clr"></div>
<div id="footer">
<p class="copyright"><? $sg = ''; include "templates.php"; ?></p>
</div>
<div id="valid">
Valid
XHTML and
CSS.
</div>
</div>
</div>
</div>
</div>
<jdoc:include type="modules" name="debug" />
</body>
</html>