Kod:
<script type="text/javascript">
function isaretle(a,b) {
var el = document.getElementById(a);
var el1 = document.getElementById(b);
el.checked = true;
el1.checked = false;
}
</script>
<input type="checkbox" id="chk0" name="devam" value="hayir" onclick="isaretle('chk0','chk1')" />Devam
<input type="checkbox" id="chk1" name="tamam" value="evet" checked onclick="isaretle('chk1','chk0')" />Tamam