check the size with javascript before upload.....

hi:

look at this coding below..

this is a coding where user can upload the file to server...its works fine.


-------

<script>
var nfiles =3;
function Expand(){
  nfiles++
  var adh = '<BR> File '+nfiles+' :<input type="file" name="File'+nfiles+'">';
  files.insertAdjacentHTML('BeforeEnd',adh);
  return false;
}

</script>
<script>

function onSubmitForm() {
    var formDOMObj = document.frmSend;
      var confirmUpload
    if (formDOMObj.File1.value == "" && formDOMObj.File2.value == "" && formDOMObj.File3.value ==

"" )
        alert("No valid file(s) selected! Please press the browse button and pick a file.")
            
    else
        return true;
    return false;
}
</script>
<table width="50%" border="0" align="center" cellpadding="0" cellspacing="0"

bordercolor="#9933CC">
  <tr>
    <td>
       <form name="frmSend" method="POST" enctype="multipart/form-data"

action="uploadTester.asp" onSubmit="return onSubmitForm();">
   <Div ID=files>
    File 1: <input name=File1 type=file onchange="CheckSize()"><br>
    File 2: <input name=File2 type=file onchange="CheckSize()"><br>
    File 3: <input name=File3 type=file onchange="CheckSize()">
   </Div>
   <Input Type=Button Value="Add file" OnClick=return(Expand())

Style="border=0;background=#6699FF;cursor:hand" id=Button1 name=Button1><font size="1"

face="Arial, Helvetica, sans-serif"><a href="javascript:alert('Click to add more file to upload

.');"> << What
  is this?</a></font> <br>
      <br>
        <input name=submit1 type=submit id=submit1 style="margin-top:4;" value="Upload">
      
    </form>
      
      </td>
  </tr>
</table>
<p><br>
 


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However, now i wanna add some coding for << onchange="CheckSize()" >>


i wan to do the coding in javascript to that checksize() function so that,

fucntion will check so that when the user click the "browser" and choose a file,it will check the size of file first....If the size exceed 100K, there is a message --alert("File Size Exceed
100KB"). Then, that input will BLANK again so that user can re-choose..


One more thing hv to mention is as u can see,user can "Add file" to upload more than 3 file
right?So, maybe there is a user add until 10 files to upload. Let say, the first 5 files is
ok(means doenst exceed the size). But file number-6 was exceed the size, so ONLY the input
number-6 will blank; the previous 5 input(which doenst exceed the size) nothing change on it. Means every input will be check...



Let me know if u guys dont understand my Q



q