Ti posto volentieri il listato (si tratta di un file html con i javascript interni)

eccolo:

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<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta name="GENERATOR" content="Quanta+ HTML Editor v.2.00 (X11; U; Linux 2.2.16 i586)">
<meta name="Author" content="Beginners' Club">
<meta name="Description" content="Official site / Sito ufficiale">
<title>Equipe vitesse</title>
</head>
<body text="black" bgcolor="white">
<script language="JavaScript">
<!--

function fuoco1(){
document.scheda.t_giacca.focus();
}

function fuoco2(){
document.scheda.t_tshirt.focus();
}

function fuoco3(){
document.scheda.t_polo.focus();
}

function fuoco4(){
document.scheda.t_camicia.focus();
}

function fuoco5(){
document.scheda.t_smanicato.focus();
}

function fuoco6(){
document.scheda.t_felpa.focus();
}

function fuoco7(){
document.scheda.t_cappel.focus();
}

-->
</script>
<table width=650>
<tr>
<td>
<hr>
</td>
</tr>
</table>
Taglie abbigliamento sociale della scuderia


<table width="650" border="0">
<tr>
<td width="33%" align="left">
<table width="90%" border="0">
<tr>
<td width="10%" align="left" height="50">
<input type="checkbox" name="giacca" onchange="javascript:fuoco1()">
</td>
<td width="80%" align="left">
Giacca a vento
</td>
<td width="10%" align="right">
<input type="text" name="t_giacca" size=5>
</td>
</tr>
</table>
</td>
<td width="33%" align="center">
<table width="90%" border="0">
<tr>
<td width="10%" align="left" height="50">
<input type="checkbox" name="t-shirt" onchange="javascript:fuoco2()">
</td>
<td width="80%" align="left">
T-shirt
</td>
<td width="10%" align="right">
<input type="text" name="t_tshirt" size=5>
</td>
</tr>
</table>
</td>
<td width="33%" align="right">
<table width="90%" border="0">
<tr>
<td width="10%" align="left" height="50">
<input type="checkbox" name="polo" onchange="javascript:fuoco3()">
</td>
<td width="80%" align="left">
Polo
</td>
<td width="10%" align="right">
<input type="text" name="t_polo" size=5>
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="33%" align="left">
<table width="90%" border="0">
<tr>
<td width="10%" align="left" height="50">
<input type="checkbox" name="camicia" onchange="javascript:fuoco4()">
</td>
<td width="80%" align="left">
Camicia
</td>
<td width="10%" align="right">
<input type="text" name="t_camicia" size=5>
</td>
</tr>
</table>
</td>
<td width="33%" align="center">
<table width="90%" border="0">
<tr>
<td width="10%" align="left" height="50">
<input type="checkbox" name="smanicato" onchange="javascript:fuoco5()">
</td>
<td width="80%" align="left">
Smanicato
</td>
<td width="10%" align="right">
<input type="text" name="t_smanicato" size=5>
</td>
</tr>
</table>
</td>
<td width="33%" align="right">
<table width="90%" border="0">
<tr>
<td width="10%" align="left" height="50">
<input type="checkbox" name="felpa" onchange="javascript:fuoco6()">
</td>
<td width="80%" align="left">
Felpa
</td>
<td width="10%" align="right">
<input type="text" name="t_felpa" size=5>
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="33%" align="left">
</td>
<td width="33%" align="center">
<table width="90%" border="0">
<tr>
<td width="10%" align="left" height="50">
<input type="checkbox" name="cappel" onchange="javascript:fuoco7()">
</td>
<td width="80%" align="left">
Cappellino
</td>
<td width="10%" align="right">
<input type="text" name="t_cappel" size=5>
</td>
</tr>
</table>
</td>
<td width="33%" align="right">
</td>
</tr>
</table>
<font color="red" face="Verdana, Arial, Helvetica, sans-serif" size="-2">
SCEGLIERE GLI ARTICOLI DESIDERATI ED INSERIRE NELLA CASELLA A FIANCO LA TAGLIA.
</font>
</div>
</form>
</body>
</html>

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L'ho dovuto decurtare per poterlo postare.

Ho provato anche a non mettere il comando all'interno di una funzione ma direttamente nel "onchange" ma il risultato è uguale.