<input id="text1" type="text"><br>
<input name="aa" id="aa1" type="radio" onclick="text1.disabled=true"><label for="aa1">Disable</label>
<input name="aa" id="aa2" type="radio" onclick="text1.disabled=false" checked><label for="aa1">Enable</label>
<input name="aa" id="aa1" type="radio" onclick="text1.disabled=true"><label for="aa1">Disable</label>
<input name="aa" id="aa2" type="radio" onclick="text1.disabled=false" checked><label for="aa1">Enable</label>
<input name="aa" id="aa1" type="radio" onclick="text1.disabled=true"><label for="aa1">Disable</label>
<input name="aa" id="aa2" type="radio" onclick="text1.disabled=false" checked><label for="aa2">Enable</label>