F.eks. sådan:
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"
http://www.w3.org/TR/html4/loose.dtd"><html>
<head>
<title>Tomt dokument</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<style type="text/css">
html,body{height:100%;margin:0px;border:0px;padding:0px;font-family:tahoma,verdana,arial,sans-serif;font-size:small;}
</style>
<script language="javascript" type="text/javascript">
function updateShow(elm){
var td = elm.parentNode;
var inps = td.getElementsByTagName("input");
for(i=0;inps.length>i;i++)
inps[i].style.visibility = i >= elm.selectedIndex ? 'hidden' : 'visible';
}
</script>
</head>
<body>
<form id="minForm" name="minForm">
<table>
<tr>
<td>
<select onchange="updateShow(this)">
<option>-- Vælg antal inputs --</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
<option value="8">8</option>
<option value="9">9</option>
<option value="10">10</option>
</select><br>
<input type="text" name="Inp1_1" style="visibility:hidden"><br>
<input type="text" name="Inp1_2" style="visibility:hidden"><br>
<input type="text" name="Inp1_3" style="visibility:hidden"><br>
<input type="text" name="Inp1_4" style="visibility:hidden"><br>
<input type="text" name="Inp1_5" style="visibility:hidden"><br>
<input type="text" name="Inp1_6" style="visibility:hidden"><br>
<input type="text" name="Inp1_7" style="visibility:hidden"><br>
<input type="text" name="Inp1_8" style="visibility:hidden"><br>
<input type="text" name="Inp1_9" style="visibility:hidden"><br>
<input type="text" name="Inp1_10" style="visibility:hidden"></td>
<td>
<select onchange="updateShow(this)">
<option>-- Vælg antal inputs --</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
<option value="8">8</option>
<option value="9">9</option>
<option value="10">10</option>
</select><br>
<input type="text" name="Inp2_1" style="visibility:hidden"><br>
<input type="text" name="Inp2_2" style="visibility:hidden"><br>
<input type="text" name="Inp2_3" style="visibility:hidden"><br>
<input type="text" name="Inp2_4" style="visibility:hidden"><br>
<input type="text" name="Inp2_5" style="visibility:hidden"><br>
<input type="text" name="Inp2_6" style="visibility:hidden"><br>
<input type="text" name="Inp2_7" style="visibility:hidden"><br>
<input type="text" name="Inp2_8" style="visibility:hidden"><br>
<input type="text" name="Inp2_9" style="visibility:hidden"><br>
<input type="text" name="Inp2_10" style="visibility:hidden"></td>
</tr>
<tr>
<td>
<select onchange="updateShow(this)">
<option>-- Vælg antal inputs --</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
<option value="8">8</option>
<option value="9">9</option>
<option value="10">10</option>
</select><br>
<input type="text" name="Inp3_1" style="visibility:hidden"><br>
<input type="text" name="Inp3_2" style="visibility:hidden"><br>
<input type="text" name="Inp3_3" style="visibility:hidden"><br>
<input type="text" name="Inp3_4" style="visibility:hidden"><br>
<input type="text" name="Inp3_5" style="visibility:hidden"><br>
<input type="text" name="Inp3_6" style="visibility:hidden"><br>
<input type="text" name="Inp3_7" style="visibility:hidden"><br>
<input type="text" name="Inp3_8" style="visibility:hidden"><br>
<input type="text" name="Inp3_9" style="visibility:hidden"><br>
<input type="text" name="Inp3_10" style="visibility:hidden"></td>
<td>
<select onchange="updateShow(this)">
<option>-- Vælg antal inputs --</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
<option value="8">8</option>
<option value="9">9</option>
<option value="10">10</option>
</select><br>
<input type="text" name="Inp4_1" style="visibility:hidden"><br>
<input type="text" name="Inp4_2" style="visibility:hidden"><br>
<input type="text" name="Inp4_3" style="visibility:hidden"><br>
<input type="text" name="Inp4_4" style="visibility:hidden"><br>
<input type="text" name="Inp4_5" style="visibility:hidden"><br>
<input type="text" name="Inp4_6" style="visibility:hidden"><br>
<input type="text" name="Inp4_7" style="visibility:hidden"><br>
<input type="text" name="Inp4_8" style="visibility:hidden"><br>
<input type="text" name="Inp4_9" style="visibility:hidden"><br>
<input type="text" name="Inp4_10" style="visibility:hidden"></td>
</tr>
</table>
</form>
</body>
</html>