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Symptom: Moving the mouse over an image that is supposed to change gives a JavaScript error instead.
Affects: 
Reason: The Image array used to manipulate images already loaded is not supported by JavaScript 1.0.
Workaround: Test the availability of the images array:
1. in the link: onMouseover="if (document.images) dotheswap();">
2. in the script: if (document.images) { // Here we can preload
3. in the functions: if (!document.images) return; // leave if not supported