Hallo Ben.
<form name="units" ...>
<input type="text" name="unit[0]" size="6">
<input type="text" name="unit[1]" size="6">
<input type="text" name="unit[2]" size="6">
...
</form>
document.units.elements['unit[0]']
Damit sprichst du das erste Textfeld an.
Siehe:
http://de.selfhtml.org/javascript/objekte/elements.htm#allgemeines
Man liest sich, H2O
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