function check_contact(){

    var email = document.getElementById("email");
    var a_position = email.value.indexOf("@");
    var dot_position = email.value.indexOf(".");
    var email_length = email.value.length

    if (document.getElementById("name").value == ""){
      document.getElementById("name_note").style.display = "block";
	  document.getElementById("name").focus();
	  return false;
    }

    else if (document.getElementById("email").value == ""){
      document.getElementById("name_note").style.display = "none";
      document.getElementById("email_note").style.display = "block";
	  document.getElementById("email").focus();
	  return false;
    }

    else if (a_position == -1 || a_position == 0 || dot_position == -1 ||	dot_position == 0 || a_position > dot_position || dot_position == a_position + 1 || email.value.length - dot_position < 3) {
      document.getElementById("name_note").style.display = "none";
      document.getElementById("email_note").style.display = "none";
      document.getElementById("email_note2").style.display = "block";
	  document.getElementById("email").focus();
	  return false;
      }

    else if (document.getElementById("topic").value === ""){
      document.getElementById("email_note").style.display = "none";
      document.getElementById("email_note2").style.display = "none";
      document.getElementById("topic_note").style.display = "block";
	  document.getElementById("topic").focus();
	  return false;
    }

    else if (document.getElementById("message").value === ""){
      document.getElementById("topic_note").style.display = "none";
      document.getElementById("message_note").style.display = "block";
	  document.getElementById("message").focus();
	  return false;
    }

}


function reset_contact(){
    document.getElementById("name_note").style.display = "none";
    document.getElementById("email_note").style.display = "none";
    document.getElementById("email_note2").style.display = "none";
    document.getElementById("topic_note").style.display = "none";
    document.getElementById("message_note").style.display = "none";
}