<select name="slt" size="1" onchange="ddddd(this)">
<option selected>------</option>
<option>1</option>
<option>2</option>
<option>3</option>
</select>
<input type=text name=t1 value="111" size="22">
<input type=text name=t2 value="222" size="22">
<input type=text name=t3 value="3333" size="22">
<script language="javascript">
<!--
function ddddd(o)
{
switch(o.selectedIndex)
{
case 1 :
t1.disabled = false;
t2.disabled = true;
t3.disabled = true;
break;
case 2 :
t1.disabled = true;
t2.disabled = false;
t3.disabled = true;
break;
case 3 :
t1.disabled = true;
t2.disabled = true;
t3.disabled = false;
break;
default :
t1.disabled = false;
t2.disabled = false;
t3.disabled = false;
break;
}
}
//-->
</script>
