<html>
<input type="file" name="file1" onchange="ShowSize(this.value)">
<script language="JavaScript">
<!--
function ShowSize(files)
{
var fso,f;
fso=new ActiveXObject("Scripting.FileSystemObject");
f=fso.GetFile(files);
alert(f.size+" Bytes");
}
//-->
</script>
</html>
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