function showSub(id) {
	document.getElementById(id).style.display = "inline-block";
}

function hideSub(id) {
	document.getElementById(id).style.display = "none";
}

function activate_sub(id) {  

   var id_c = "";

   if (id != 0) { 
     for (var i=1; i<=6; i++) {
     
       id_c = "c_" + i + '';
       if (document.getElementById(id_c)) {
         document.getElementById(id_c).style.display = "none";
       }
     }      
     
     id_c = "c_" + id + '';
     if (document.getElementById(id_c)) {
        document.getElementById(id_c).style.display = "inline-block";
     }   
   }
   
}