java find the error7

    var name=document.forms["insert"]["in_username"];
    var age=document.forms["insert"]["in_userage"];
    var address=document.forms["insert"]["in_address"];
    var phone=document.forms["insert"]["in_userphone"];

    if(name.value.length == 0)
    {
        alert("please enter employee name");
        name.focus();
        return false;
    }
    if(age.value.length == 0)
    {
        alert("please enter employee age");

        return false;
    }

    if(address.value.length == 0)
    {
        alert("please enter employee address");
        return false;
    }

    if(phone.value.length != 10 || phone.value.charAt(0)!=9)
    {
        alert("please enter valid phone number");
        return false;
    }
    return true;
}

function phone()
{
document.getElementById("in_id_userphone").onkeypress=function(e)
{
var e=window.event || e
var keyunicode=e.charCode || e.keyCode
return (keyunicode>=48 && keyunicode<=57 )? true : false
}
}

function age()
{
document.getElementById("in_id_userage").onkeypress=function(e)
{
var e=window.event || e
var keyunicode=e.charCode || e.keyCode
return (keyunicode>=48 && keyunicode<=57 )? true : false
}
}

function employeeInsert()
{
        var ins = document.getElementById('insert');
        ins.action = 'employeeinsert.do';
        ins.method='post';

}

</script>*/