Looks like a typo. In IE, if any of the images are missing, it will prevent the script from progressing to the next stage. Other browsers are more forgiving. This:
Code:
"images/navigation/about/deep-up"
should be (unless you have another image with that filename and a different extension on the server that you would prefer to be preloaded):
Code:
"images/navigation/about/deep-up.gif"
There could also be other problems. However, after correcting this in a local version of your preload page, IE no longer hung up.
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