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var nameInfo = <s:text name="name.required"/>;
var passwordInfo = <s:text name="password.required"/>;
function checkdata()
{  
if (document.frmlogin.username.value=="")
{
alert(nameInfo);
document.frmlogin.username.focus();
return false;
}
if (document.frmlogin.password.value.length==0)
{
alert(passwordInfo);
document.frmlogin.password.focus();
return false;
}  
}
</script>
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