<form action="" method=GET>
<input type=text value=TTTT disabled=true>
<input type=text value=123124 ReadOnly=true>
<input type=text value=124tdfsdf23fas disabled=true>
<input type=button disabled=true>

<script>
for (var i = 0; i <= 5; i++) {
for (var j = 0; j <= 5; j++) {
document.forms[i].elements[j].ReadOnly=false;
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</script>