I have 3 radio buttons (r1, r2, r3) and one text field (t1). t1 is set to readonly="true" when the page loads, but when a user selects r1, I want to set readonly="false". t1 must be set back to readonly="true" when r2 or r3 is selected.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<TITLE> New Document </TITLE>
if(document.forms.r1.checked == true)
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