multiple ad blocks, how to specify the 1st block?

[Hugene]

I read a lot about this here before, but I cant rember now.

When I look at the adsens page, its seems that the 1st block is the one that is called first by the html in the page.

Is there a way to change that? Can I specify which block is the most important one?

thanks

[moishe]

you can use css positioning so that while an ad appears first on the page in a browser, it is actually not the first ad in the code of the page.
From Google's website:

7. How do I define the 'first' ad unit?

The multiple ad units system serves ads to each ad unit in order of their appearance in your HTML code. In most cases, this will be the same order as the ad units appear on your page. However, if your code uses DIV tags or other positioning techniques, it’s possible that our system will recognize an ad unit as the first ad unit, even if it appears to the end user at the very bottom of the page. Because our system may not always fill all of your ad units on any one page, it’s important that you ensure that your 'main' ad unit appears first in the HTML code.

[thewonderwall]

does anyone have any actual code that would show me how to use layers... or can they link to a previous post on webmasterworld that shows how to do this? (couldn't find what I needed using search function)