function checkUsername(Typed) {
  var parentBox = Typed.parentNode;
  var txt = stringinput.value;
  if (txt.length > 7) {
    parentBox.className = "valid";
  } else {
    parentBox.className = "invalid";
  }
}

function checkPassword(Typed) {
  var parentBox = Typed.parentNode;
  var txt = Typed.value;
  if (txt.length > 2 && txt.length < 6) {
    parentBox.className = "almostvalid";
  }
  else if (txt.length > 5) {
    parentBox.className = "valid";
  }
  else {
    //parentBox.className = "invalid";
	parentBox.className = "";
  }
}

function checkEmail(Typed) {
  var parentBox = Typed.parentNode;
  var txt = Typed.value;
  if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(txt)) {
    parentBox.className = "valid";
  } else {
    //parentBox.className = "invalid";
	parentBox.className = "";;
  }
}