Hjælp til validering af felter

<script type="text/javascript">
function validate(oForm) {
    if (!(/^[0-9]{2}-[0-9]{2}-[0-9]{4}$/).test(oForm.dato.value)) {
        alert("Forkert dato");
        oForm.dato.focus();
        return false;
    }
    if (oForm.item_number.value=="") {
        alert("Skriv et nummer");
        oForm.item_number.focus();
        return false;
    }
    if (!(/^[0-9]+$/).test(oForm.kg_onstock.value)) {
        alert("Skal være et tal");
        oForm.kg_onstock.focus();
        return false;
    }
    return true;
}
</script>

<fieldset>
    <legend>Stock information</legend>
    <div style="padding-top:12px">
    <form name="stock" method="POST" action="send_data.asp" onsubmit="return validate(this)">
            <p><b style="color:#ff0000"><%=strErr%></b></p>
            <label>Date:</label>
            <div><input type="text" name="dato" size="20" value="<%=date()%>" ></div>
           
            <label>Item number:</label>
            <div><input type="text" name="item_number" size="20" value="1869606" readonly="readonly"></div>
            <label>Number of kg of stock:</label>
            <input type="text" name="kg_onstock" size="8"  maxlength="7" value="0">
                <a href="java script:void(0);" onmouseover="return overlib('Please enter the number of kg you have in stock of this product', CAPTION, 'Number of kg of stock');" onmouseout="return nd();"><IMG SRC="images/help.jpg"  BORDER="0" ALT=""></a>

         
          <p style="margin-top:12px"><input type="submit" value="<%=trans_funktion("send")%>" name="Action" style=";"id="knap">
        </form>
    </div>
</fieldset>

    if (!(/^[0-9.]+$/).test(oForm.kg_onstock.value)) {