Hi there, I'm using 1.5 (can't believe 1.51 is out even before I managed to get my new 1.5 up and running!)

I want to use a facebook plugin which requires the following:
<div class="fb-like" data-href="http://www.traditionalirishgifts.com" data-send="false" data-layout="button_count" data-width="100" data-show-faces="false"></div>

The problem is that data-* attributes are invalid unless you are using the HTML5 doctype.

Is it ok to change the doctype of zencart or does that cause loads of problems? Is there a better solution? I don't know much about doctypes!

Thanks