I just ran into this a bunch – works fine in FireFox … of course.
Well apparently, Internet Explorer won’t allow you to have a trailing comma in a array or object definition. Let me show you:
1 2 3 4 | functionCall({ options: {1,2,3}, others: {1,2,3}, }); |
The trailing comma after the other’s line is making IE expect another identifier. So, just strip it out so that line is now:
1 | others: {1,2,3} |
And you should be golden!
Now, if only IE told me what line the error was on 
(For those who need a tip, I loaded up the site in firefox with jsview extension – and went to view all js. Then do ctrl-L to jump to a line – and type in the line number that IE mentions… see if there is something around there that looks like this scenario)