Untitled

//Get the button:
mybutton = document.getElementById("scrollToTop");

// When the user scrolls down 20px from the top of the document, show the button
window.onscroll = function () {
  scrollFunction();
};

function scrollFunction() {
  if (document.body.scrollTop > 20 || document.documentElement.scrollTop > 20) {
    mybutton.style.display = "block";
  } else {
    mybutton.style.display = "none";
  }
}

function myFunction() {
  var x = document.getElementById("mobileMenuLinks");
  if (x.style.display === "block") {
    x.style.display = "none";
  } else {
    x.style.display = "block";
  }
}

// When the user clicks on the button, scroll to the top of the document
function topFunction() {
  document.documentElement.scrollTop = 0; // For Chrome, Firefox, IE and Opera
}

function validateForm(event) {
  event.preventDefault();
  var inputName = document.forms["contactForm"]["fname"].value.trim();
  if (!inputName) {
    alert("Please, fill out your name.");
    return;
  }

  var inputEmail = document.forms["contactForm"]["femail"].value.trim();
  var inputNumber = document.forms["contactForm"]["fnumber"].value.trim();
  if (!inputEmail && !inputNumber) {
    alert(
      "Please enter either an email or a phone number, so I can get back to you!"
    );
    return;
  }

  var input = document.forms["contactForm"]["fmessage"].value.trim();
  if (!input) {
    alert("You didn't write any message!");
    return;
  }
}