map onclick not working in IE. Fine in Chrome

Hello, I've got a strange issue with my map loading fine in Chrome
but
not in IE. The issue itself deals with the onClick of markers. The
map successfully loads 494 markers (using MarkerClusterer), but when
clicking the markers, IE fails miserably -- Chrome works great.

I get multiple Javascript errors, but the first cause is: Line: 246,
Char: 43, Unknown runtime error.

The link to the map is: http://bit.ly/asp6FZ

I've done multiple searches and poured over the code. Any thoughts or
solutions!!??. Thanks!

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