Execute AJAX loaded HTML5

Question

For my CMS I'm loading the contents with AJAX (using Prototype). THe new Javascript I'm executing by Prototype's internal method string.evalScripts(). This works fine. But now I saw that HTML5-Elements like the video-tag isn't executed. The code is there, but the browser doesn't show it. How do I execute these HTML5-Elements?

Answer 1

Take a stone a threw it on me. It is executed, but I used relative paths. So the paths were wrong.