Button on HTML calling VB function

Have a button calling a vb function on the click event.
I'd like to pass the filepath/filename into the function using file input type button..
How do I do this?
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<Script Language=VBScript>

function readFile (file)
on error resume next
Set objFSO = CreateObject("Scripting.FileSystemObject")
vText = ""
'input text file
Set objTF = objFSO.OpenTextFile(file)

    do while not objTF.AtEndofStream
     vText = vText & objTF.Readline

Set objTF = nothing
Set objFSO = nothing
end function

sub read_OnClick()
testform.fileholder.value=readfile( testform.testfile.value)
end sub


<form name=testform>
<input type=file name=testfile >&nbsp;&nbsp; <INPUT type=button value=read name=read></P>
<P> <INPUT style="WIDTH:
 511px; HEIGHT: 173px" size=1443 name=fileholder rows="100"
cols="100" readonly width="44" vspace=44>

I have already posted the same in ur previous thread

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