ciao br1 e grazie sempre per il tuo intervento

Ora ti aggiorno:
ci lavoro da giorni ed ho ottenuto questo:

<script LANGUAGE="javascript">
var selezioni = 0;
<!--
// determine browser type
//var browser = (navigator.userAgent.toLowerCase().indexOf("msie") != -1)?"ie":"ns";

function MoveUp()
{
ShiftListSelections(document.frm.usedfields, false);
}

function MoveDown()
{
ShiftListSelections(document.frm.usedfields, true);
}

/*
** Add the selected fields from the freefields listbox into the
** usedfields listbox, then remove them from the freefields listbox
*/
function AddFields() {
if (selezioni <= 2)
{
MoveSelectedListItems(document.frm.freefields,docu ment.frm.usedfields,false);
selezioni = selezioni
if (selezioni == 2)
{//document.write(selezioni)
document.frm.freefields.disabled = true;
}
}
else
{
//MoveSelectedListItems(document.frm.freefields,docu ment.frm.usedfields,true);
document.frm.freefields.disabled = true;
}
}

/* This function does the opposite of Addfields, but ensures the free list is alphabetical */
function RemoveFields() {
MoveSelectedListItems(document.frm.usedfields,docu ment.frm.freefields,true);
//Force a refresh to keeps netscape happy.
//if (browser=="ns") history.go(0);
}

function SelectAll(sel)
{
for (var x=0; x<sel.length; x++){sel.options[x].selected=true;}
}

//-->
</script>


<form id="frm" name="frm">
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr valign="top">
<td><table border="0">
<tr>
<td height="15"><font face="Arial, Helvetica, sans-serif" size="1">List
1 (alpha ordering)</font></td>
<td height="15"><font face="Arial, Helvetica, sans-serif" size="1"></font></td>
<td height="15"><font face="Arial, Helvetica, sans-serif" size="1">List
2 (manual ordering)</font></td>
</tr>
<tr>
<td height="118"><font size="1" face="Arial, Helvetica, sans-serif">
<select name="freefields">
<option value="7">Freds mate Freda</option>
<option value="8">Harrys mate Harriet</option>
<option value="9">Petes mate Petula</option>
<option value="10">Steves mate Stephanie</option>
<option value="11">Wallys mate Wilma</option>
<option value="12">Zebedees mate Florence...</option>
</select>
</font></td>
<td height="118"><div align="center"><font size="1" face="Arial, Helvetica, sans-serif"> [img]images/arrowleft.gif[/img]





[img]images/arrowright.gif[/img] </font></div></td>
<td height="118"><font size="1" face="Arial, Helvetica, sans-serif">
<select name="usedfields" size="8">
<option value="1">Freddy the Fish</option>
<option value="2">Wally the Whale</option>
<option value="3">Harry the Halibut</option>
<option value="4">Peter the Puffer</option>
<option value="5">Steve the Shark</option>
<option value="6">Zebedee the Springy Thing</option>
</select>
</font></td>
</tr>
<tr>
<td>[img]images/arrowup.gif[/img][img]images/arrowup.gif[/img]</td>
<td></td>
<td><div align="center"><font face="Arial, Helvetica, sans-serif" size="1"> [img]images/arrowup.gif[/img] [img]images/arrowdown.gif[/img] </font></div></td>
</tr>
</table></td>
</tr>
</table>
</form>



ma ora sto proprio per impazziere sul come fare per decrementare la variabile selezioni quando dalla select di destra si spostano i valori a sx e quindi far ritornare attiva la select di sx

heeeellelelelppppppppp