function select_wylacz() {
 if (!document.all) return;
 else {
   for(i=0;i<document.all.tags('select').length;i++){
      s=document.all.tags('select')[i];
      s.style.visibility='hidden';
   }
 }
}
function select_wlacz() {
 if (!document.all) return;
 else {
   for(i=0;i<document.all.tags('select').length;i++){
      s=document.all.tags('select')[i];
      s.style.visibility='visible';
   }
 }
}