Adding H1 Tag To Joomla Article Title

As most SEO experts believe, H1 tag on a website article title is given more weight by search engines, particularly Google. I believe it and I can prove it. If you check my other website, JoomlaHacks.com, most of my article comes out on page one in Google on every keywords I targeted. But Joomla does not tag the article title with H1. Instead they enclose it with "<td class="contentheading"></td>. Here's a tutorial on how you can enclose it with H1 tag.