I am working with this piece of code and it is not firing when I put it in the page I need which is static HTML. It does work if you create a plain HTML page, but it is not working on the page I need.

HTML Code:
<form name="CTTPDD" action="https://example.com" method="post" target="_blank"><input type="hidden" value="##.##" name="campaign" /><input name="repeat" type="hidden" value="1"><input type="image" src="image.gif" value="submit" name="submit" /></form>
What could it be?

Please can you help.