Username - Pass thru Form to TXT

[nealif]

I am trying to write a page that reads the username with
javascript and then puts the value into the form for username
which in turn writes to a *.txt file. I have no clue what I am
doing.

This part works:
<script language="VBscript">

Dim X

set X = createobject("WSCRIPT.Network")

dim U

U=x.UserName

</script>

Now I need to know how to put it into this part for the form:
<TD><input type="hidden" name="username" >
</td>

Thanks so much!