> if (!navigate.WaitAliasChild('carrier', 5000).Width == 0 || navigate.WaitAliasChild('carrier', 5000).Exists)
> because you're calling code in your IF clause for an object that might not exist yet.
If you don't like nested conditions, you may use the fact that JScript uses short circuit conditionals. The code in this case may look like this:
if ((navigate.WaitAliasChild('carrier', 5000).Exists) && (navigate.carrier.Width > 0))
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