function isInteger(s){
    var i;
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    return true;
}

function isDept(dept) {
  var mydept = dept;
  if ( (mydept == "2A") || (mydept == "2a") ||(mydept == "2B") || (mydept == "2b") || (mydept == "971") || (mydept == "972") || (mydept == "974") || (mydept == "973")) {
  	return true;
  }
  if ( (mydept.length == 2) && isInteger(mydept) && (mydept != "00") && (mydept != "96") && (mydept != "97") && (mydept != "98") && (mydept != "99")) {return true;}
  else {return false;}
}