All the error 80020101 means is that there was an error, of some sort, while evaluating JavaScript. If you load that JavaScript via Ajax, the evaluation process is particularly strict.
Sometimes removing // will fix the issue, but the inverse is not true... the issue is not always caused by //.
Look at the exact JavaScript being returned by your Ajax call and look for any issues in that script. For more details see a great writeup here
http://mattwhite.me/blog/2010/4/21/tracking-down-error-80020101-in-internet-exploder.html
