I'm not sure if your publisher id is what you'd give your webmaster, it's not really a code. I just know when I put ads on my sites, I have to create ad units which are actually code. It's at My ads and then create ad units. But I don't have a webmaster so I'm not sure what he or she is looking for.
Edit: Sorry, tired, left out some info. You get the code I mentioned at your actual Adsense account, not here at HP.
I am not sure I understand what you mean but I have had the site for several years. I am changing it's useage with no change in domain name from a photography site to a felting site. I have my own domain name there and have had google analytics running on it for the same length of time. The webmaster has asked me to give him code from Google for a horizontal adsense block so that he can place the bar across the bottom of my pages using the code I asked about! Does anyone know the answer to that?
I'm pretty sure what the webmaster is talking about is a leaderboard ad unit. You'd have to go into your adsense account, click my ads and then click creat new ad unit. It's kind of self explanatory from there; you pick the leaderboard ad format, get the code, copy it.
Edit: I'm very tired right now, but I'm wanting to help. Let me give better instructions --
you sign into your adsense account. At the top you'll see "my ads". You click on that. Next screen, you'll see a button that says "new ad unit". You click on that. The next screen will give you a choice of ad sizes. Sounded like your webmaster wants a leaderboard ad, because you said he or she wanted a horizontal ad. You'd click on the leaderboard and then "save and get code". It will give you the code which you can copy and send to the webmaster.
I'm hoping this is what you need. This is what it sounded like to me what the webmaster is asking for.
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