function dis_or_enable_Class(class, en) {

   var elements = document.getElementsByTagName("*");

   for(var i=0; i < elements.length; i++){
      if (elements[i].className == class) {
         if (en == 0) elements[i].disabled = "disabled";
         else if (en == 1) elements[i].disabled = "";
      }
   }
}

function dis_or_enable(id_to_change, id_supervisor, en) {

   var change = document.getElementById(id_to_change);
   var super = document.getElementById(id_supervisor);

   if (en == 0) { 
      change.disabled = "disabled";
      change.value = "";
   }
   else if (en == 1) change.disabled = "";
}