Problem with jQuery 1.6.0

Hello

when I want to add a html-file via Lightbox2 with the following code I get an error when I use jQuery 1.6.0 in the html-file. With jQuery 1.5.1 it works.

<a href="' . <?php $base_url . '/' .  path_to_theme() . ?>'/iframe-test.html" rel="lightframe[|width:716px; height:469px;scrolling:no]">

My example html-file is attached