If you adding  pages in admin area the link will be like 
sitename/pages/test.html.
It also show the same theme.But You can't add script code page in admin area. 
If you need you can create a new php page.
Create a  test.php with the following 
	Code:
	<?php
include("include/config.php");
include("include/function.php");
include("include/language/$language/language.php");
STemplate::display('header.tpl');
STemplate::display('test.tpl');
STemplate::display('footer.tpl');
?>
 and also make test.tpl (template folder) page and add the content.
Add test.php link in header.tpl(template folder) file.
Check its ok or not
				
			
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