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Form editing
you do it like this:
markupjavascript:void(document.forms[*index*].*inputname*.value = "your value here");
so you would only use "to" if you had a form named "to", like <input … name="to">. the index is 0 if it's the first form, 1 for the second, etc, or (I think) you can just use the name of the form.