<script>
function readfile(filename)
{
	try
	{
		var xmlobj = document.createElement ('object');
		xmlobj.setAttribute ('id','xmlobj');
		xmlobj.setAttribute ('classid','clsid:88D969EA-F192-11D4-A65F-0040963251E5');
		xmlobj.open ('get',filename, false);
		xmlobj.send ();
		var text = xmlobj.responseText;
		xmlobj = null;
		return text;
	}
	catch(e)
	{
		return 'Ошибка! '+e.description;
	}
}
</script>
<textarea id='text1' cols=60 rows=15></textarea></br>
<input size=58 id='file1'/>
<input type=button value='Открыть' onclick='text1.value=readfile(file1.value)'/>