I have an HTML page. I want to insert another website into that page. How do I do this?
I currently have this:

<img src="<?php echo $config[template_url] ?>/images/sym.jpg" align="absmiddle" style="margin-right:6px ">
<a href="http://www.thesiteineed.com/something/DesktopDefault.aspx?pageid=0000&pagealias=FramesSe arch">Link</a>

This link currently opens in its own window.

You cannot insert a php page or template into a .html page.

Maybe in .htaccess ...

AddType application/x-httpd-php .html

All HTML files are processed as PHP.