PHP attaching css and JS files to current page


is there a way how a PHP class can attach JS (javascript) and CSS documents
to current web page in which the class is instanced ?
till now i used an "echo" which "write" a <script></script> code into
current document.
in this javascript, i used to have a createElement function to attache
C\other CSS or JS file.

it's not so clean and maybe a better possibility exists. Thanks to let me

Windows XP x64 SP2
PostgreSQL 8.3.5 / MS SQL server 2005
Apache 2.2.10
PHP 5.2.6
C# 2005-2008