campo1 campo2
campo3 campo4

e così anche negli altri file data.txt.

La pagina html è questa:
codice:
<html>
<head>
    <meta http-Equiv="Cache-Control" Content="no-cache">
    <meta http-Equiv="Pragma"    Content="no-cache">
    <meta http-Equiv="Expires"    Content="0">

<style type="text/css">

body {
font-size: 100%;
background: #9a9;
}
h3 {
width: 180px;
font: 18px "arial black";
color: #474;
margin: 80px auto 0 auto;
}
#stuff {
width: 600px;
margin: 10px auto;
}
#stuff th {
font: 11px "arial black";
color: #060;
letter-spacing: .4em;
border-left: 3px #000 solid;
border-right: 1px #000 solid;
background: #fff;
}
#stuff td {
font: normal 12px monospace;
text-align: center;
padding: 3px;
border-top: 1px #888 solid;
border-right: 1px #000 solid;
border-bottom: 1px #888 solid;
border-left: 3px #000 solid;
background: #d0d8d0;
}
#buffer {
display: none;
}

</style>
<script type="text/javascript">

function caricatesto()
{
if (!document.getElementById || !document.getElementsByTagName)
return;
var frm = null,prenode,tbod = document.getElementById('tbod'),data = '';
if ((frm = top.frames['buffer']) //iframe
&& frm.document)
{ //get <pre> parent
prenode = frm.document.getElementsByTagName('pre').item(0);
if (null != prenode && null != prenode.firstChild && /#text/.test(prenode.firstChild.nodeName)) //text node
{
data += prenode.firstChild.data; //read
data = data.split(/[\n\r]/); //separate lines
data.splice(0, 0); //lose first one (legend)
var i = 0,l = data.length,rowdata,ii, ll, tr, td;

for (; i < l; ++i)
{

tr = document.createElement('tr'); //new row
tbod.appendChild(tr);
rowdata = data[i].split("\t"); //separate bits
for (ii = 0, ll = rowdata.length; ii < ll; ++ii)
{
var mia = rowdata[1];
td = document.createElement('td'); //new cell

var link = document.createElement("a"); 

link.setAttribute("href", mia); 
//link.setAttribute("class", "thickbox"); 
if (ii != 1) {
link.appendChild(document.createTextNode(rowdata[ii])); 
td.appendChild(link);
tr.appendChild(td);
}
}
}
}
}
}

</script>

</head>
<body>



<select onchange="javascript: window.frames.buffer.location.href =this.options[this.selectedIndex].value;caricatesto();">
	<option value="">-------</option>
    <option value="data1.txt">uno</option>
    <option value="data2.txt">due</option>
	<option value="data3.txt">tre</option>
</select>
</form>

<h3>Progetto</h3>
<table id="stuff">
<thead>
<tr>
<th>descrizione</th>

</tr>
</thead>
<tbody id="tbod">
</tbody>
</table>
<iframe src="" id="buffer" name="buffer" ></iframe>
</body>
</html>