Using JS To Dynamically Position & Run A Script?

My overall challenge is to make up for what I consider to be a design flaw in how Google Ad Manager works. What I am trying to accomplish is create a way for an advertiser to randomly rotate through whichever ad formats are available, rather than get locked into a particular ad slot location.

This has required several steps, most of which I've been able to work out by myself, and now I'm down to what I expect is the last big issue. Because Google Ad Manager pairs up the highest priority advertiser with the first loaded ad slot script, the most important task was to randomize the load order of the scripts. Doing this, however, necessitates pairing up those scripts with the appropriate space set aside for them on the page, more or less after the fact.

The code I'm having trouble with is the part where I try to move the node containing the active script to the its desired location and is showing just about every permutation of result except the one that I want, depending on browser.

var moveithere = document.getElementById(newmodid);
moveithere.appendChild(divinloader[i]);
moveithere.appendChild(scriptelement[i]);

Not surprisingly, IE breaks as soon as it gets to this point and nothing happens with the divinloader[i] node OR the scriptelement[i] node - I have seen some references that it's not likely to like this and perhaps some recommendations about how to handle it, so I'm not too concerned about that just yet.

Firefox doesn't throw any kind of an error, but neither does the scriptelement[i] node do anything at all, even though the divinloader[i] node migrates to where I want it. Chrome comes the closest to working - the script runs, but not in the location that I want. Although I don't expect it's been an exhaustive search, I have tried a number of other approaches and this one has seemed to get me the closest to the desired result with the simplest coding. As to what's currently acceptable coding and what's not, I won't pretend to have a clue.

To see the full code in action, what it does, what I'm trying to do and to check for errors (likely) or offer suggestions on how I could get there more easily just use the following - I've substituted simpler code so that you don't have to pull down the actual Google Ad Manager scripts but it seems to work exactly the same and shows what I'm trying to do anyway. Hopefully there aren't any unnecessary artifacts still present.

[Code]...