Risolto, posto la soluzione


Per semplicita' facciamo il caso di soli 3 menu', anziche' 10 ....

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

var i_01_count=0;
var i_02_count=0;
var i_03_count=0;
var j_sel;

function Wmenu(mySubject) {
var Indx=mySubject;
if (Indx=="B" || Indx=="C") { document.forms.FrontPage_Form1.feed.value='Yes';
if (j_sel==1) { i_01_count=1; }
if (j_sel==2) { i_02_count=1; }
if (j_sel==3) { i_03_count=1; }
}
else { document.forms.FrontPage_Form1.feed.value='Click here';
if (j_sel==1) { i_01_count=0; }
if (j_sel==2) { i_02_count=0; }
if (j_sel==3) { i_03_count=0; }
}
}


<body>
<form method="POST" name="FrontPage_Form1">

<select name="act_1" id="act_1" onchange="if (i_02_count==0 && i_03_count==0) {
j_sel=document.getElementById('act_1').name.substr ing(4);
Wmenu(this.value);}">
< option value="A">A</option>
< option value="B">B</option>
< option value="C">C</option>
< option value="D">D</option>
< /select>


< select name="act_2" id="act_2" onchange="if (i_01_count==0 && i_03_count==0) {
j_sel=document.getElementById('act_2').name.substr ing(4);
Wmenu(this.value);}">
< option value="A">A</option>
< option value="B">B</option>
< option value="C">C</option>
< option value="D">D</option>
< /select>


< select name="act_3" id="act_3" onchange="if (i_01_count==0 && i_02_count==0) {
j_sel=document.getElementById('act_3').name.substr ing(4);
Wmenu(this.value);}">
< option value="A">A</option>
< option value="B">B</option>
< option value="C">C</option>
< option value="D">D</option>
< /select>