I've been toying around with Drupal 7 for a couple of weeks now, and I think I understand how the theming system works, but I have a question.

I'm looking at Zen's default theme right now, and I understand that you're supposed to tweak the CSS files in the starterkit to begin building a more substantial sub-theme, but what if I wanted to change the layout of the page altogether?

Currently the Zen theme has the regions laid out something like this (please pardon the massively crude drawing, I just wanted to illustrate something):



And if I wanted it to be laid out like this instead:



Which of the theme files am I supposed to edit/hack? I'm assuming it's either page.tpl.php or html.tpl.php. Or is this something that's supposed to be done with CSS?


Question: Cycling on Manchester Metrolink tram routes
Answer: Highway Code rule 300 - You MUST NOT enter a road, lane or other route reserved for trams. A road or lane reserved for trams will have signs like this:



or road markings that say TRAM ONLY.

If cyclists are allowed on that particular section of tramway then it will be indicated by a sign, like this above or below the tram sign:



or the road markings will indicate that cyclists are allowed (this is from Edinburgh):



Legal issues aside, cycling along a tramway can be dangerous. This blog entry describes the problem:


  The tram lines have also proven to be a nightmare for cyclists – set in smooth concrete or rough setts, with buses and taxis forcing your line and on dark and wet nights, many a cyclist has fallen victim to them and broken their bones and their bikes. It was apparent that the people behind Edinburgh’s tram had made absolutely zero allowance in their thinking around how cyclists might “interact” with tram lines when forced across them at shallow angles by poor road design and by other road users.