measurement of string length

i have the folowing code
function CheckData(frm)
{
alert((frm.Text_ID.Text));
}
frm.Text_ID - is a textbox in a form - how can i measure its string input length
i have tried frm.Text_ID.length - its not really working
so how can i have the length of the text in the text box.
thanks

Code:

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alert(String(frm.Text_ID.value).length);

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Quote:

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function CheckData(frm)
{
alert((frm.Text_ID.Text));
}

---

change it to this....

Code:

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function CheckData(frm)
{
window.alert((frm.Text_ID.Text.length));
}

---

here's an example using a textbox that uses " value " rather than " text "...

Code:

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<p><FONT face="verdana, arial, helvetica"
                  size=2>
<INPUT class=bginput tabIndex=1 maxLength=85 size=40
                  name=title value="testing"></FONT></p>
<p><FONT face="verdana, arial, helvetica" size=2>


</font>

<script language="javascript">
window.alert(title.value.length);
</script>

---

altough those solusions didnt help they gave me great direction - and i solved it thak to u!!!!!
thanks
:D