hi rajkumar,

case1:

<script language="javascript" type="text/javascript">
function check() {
if (document.Form1.chk1.checked == true)
alert("Checked");
else
alert("Not Checked");
}
</script>

case2:
<script language="javascript" type="text/javascript">
function check() {
if (document.getElementById("chkId").checked == true)
alert("Checked");
else
alert("Not Checked");
}
</script>

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Thanks,
Venkatbi...