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If you can I would recommend putting the ad code in an include file or Dreamweaver template, so you don't have to update every page manually.
I don't know what will work so I have some ads that blend in, some that stand out and a lot that are just on the default setting.
As I have a lot of archived content (widget galleries) I have just updated the index pages for now. All new galleries will have the code on every page (it is easier to do it when I am creating the galleries.)
There are some parts of my site that I haven't updated after careful consideration and studying my logs from the past few years. Also I want to wait a while before I change them over.
I want to keep my site as simple as possible so it is easy to update and there is less tempation for hackers to vandalise the site.
Also many of the people who visit the site wouldn't like it being complicated and they like the way it is laid out now.
Iíll have to respectfully disagree. I use Smarty [smarty.php.net] templates which are PHP based. All my pages have .html extensions just as they had before I switched to using Smarty.
The top, left, right and bottom sections of my pages consist of separate templates pulled into one and remain the same throughout the site unless I use a different set of templates. When I change something, such as the AdSense block on the right side, it automatically updates every page within that template set and I only need to upload one file!
I've used DW for years and have never cared for the templates or the library for the simple reason you have to upload every page for the change to take effect (there might be more to the process but it's been years since using those features). SSI/PHP is so much easier once I got past the learning curve. It did take time to learn how to use Smarty and set up the pages and understand some basic PHP. But if I can do it, anyone can. I am not a PHP wizard by any means, know very little and did not use PHP for the creation of dynamic pages. I used the Smarty template system as an experiment (most who use Smarty use PHP more extensively than I could ever hope to) and so far, it's paid off. It's so much nicer than having to update every single page and no one knows the difference. Itís just like a regular HTML site but I can apply a sitewide change in a matter of a few seconds/minutes depending on the change.
I'm always concerned about security and the way I've set up the templates (per the instructions), I think it's very secure. Then again, my site isn't dynamically based per se, with a database, etc. It just has a nice template system.