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“Prefetch”
means to get the images
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and
save them in (our own) array so
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they
are handy to assign to doc.i
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We must declare an array (and probably
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an index variable, too):
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var i, pref = new
Array(4);
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Then we set it up to hold images:
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for (i=0; i<4; i++) {
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pref[i] = new Image;
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}
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