<script type="text/javascript" language="javascript" >
function isRegisterUserName(s)
{
alert('isRegisterUserName');
var textbox=window.document.getElementById(s);
var patrn=/^[a-zA-Z]{1}([a-zA-Z0-9]|[._]){4,19}$/;
alert("s.text:"+s.value);
if (!patrn.exec(s.value)) return false
return true
}
</script>
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