It's important to create a valid HTML doctype, for rendering etc.
You can check if your html is valid using W3c schools validator.
I just validated my main page!
http://validator.w3.org/check?uri=http%3A%2F%2Fwww.webhost-choice.com%2F;accept=text%2Fhtml%2Capplication%2Fxhtml%2Bxml%2Capplication%2Fxml%3Bq%3D0.9%2C*%2F*%3Bq%3D0.8;accept-language=nl%2Cen-us%3Bq%3D0.7%2Cen%3Bq%3D0.3;accept-charset=ISO-8859-1%2Cutf-8%3Bq%3D0.7%2C*%3Bq%3D0.7