:->
Thank you all for help, but I solved my problem with JS (shame on me that I know so less about it).I only had to write down some lines:
(Thanks and courtesy of STARWAY)
function change(item){
document.f1.select1.selectedIndex=item.selectedIndex
document.f1.select2.selectedIndex=item.selectedIndex
document.f1.select3.selectedIndex=item.selectedIndex
}
.
.
<form name=f1>
<select name=select1 onchange="change(this);">
<option selected>klm
<option>hju
...
</select>
<select name=select2 onchange="change(this);">
<option selected>jiu
<option>mnu
...
</select>
<select name=select3 onchange="change(this);">
<option selected>hdy
<option>yet
...
</select>
That's all folks.
Again, thans to STARWAY.:-V