Sticky header block module? I am searching for a way to make a block behave as a drupal-highlighted area, similar to the header here. In other words, stick to the header and move along as the user roles down.

I was wondering if there is either a module that can do that, to sort of wrap the block's content or a custom workaround in my module.

I know that there exist some themes which can do that, but I would like to implement a theme-free solution.

Thanks!
This is just a CSS thing!  There a tutorial here on how to achieve it, but you're pretty much just looking at some CSS like the following. 

Edit: The tutorial has now gone, but the CSS contained is very similar to that shown below, and a quick search in your favourite search engine will return similar results.

#BLOCKID {
    position: fixed;
    top: 0;
    left: 0;
    height: 160px;
}


Just apply the CSS to your chosen block and you're off.