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<script>
function a(obj)
{
if(obj.name=='checkbox1')
checkbox2.checked=!obj.checked;
else
checkbox1.checked=!obj.checked;
}
</script>
<script>
function a(obj)
{
if(obj.name=='checkbox1')
checkbox2.checked=false;
else
checkbox1.checked=false;
}
</script>
<input type="checkbox" name="ch1" />
<input type="checkbox" name="ch2" />
<script type="text/javascript">
var chk = document.getElementsByTagName('input');
for(var i = 0; i < chk.length; i ++) {
if (chk[i].type == 'checkbox') chk[i].onclick = function() {
for(var j = 0; j < chk.length; j ++) chk[j].checked = false;
this.checked = true;
}
}
</script>
var chk = document.getElementsByTagName('checkbox');
for(var i = 0; i < chk.length; i ++) {
chk[i].onclick = function() {
for(var j = 0; j < chk.length; j++) chk[j].checked = false;
}
}