text: let name = document.getElementById("name");
  let phone = document.getElementById("phone");
  let email = document.getElementById("email");
  let date = document.getElementById("date");
  let fromAddress = document.getElementById("from_address");
  let toAddress = document.getElementById("to_address");
  let comments = document.getElementById("comments");
  
  function isNotEmpty(value) {
      if (value == null || typeof value == "undefined") return false;
  
      return (value.length > 0);
  }
  
  function hasNumbers(num) {
      return (num.length > 0) && !isNaN(num);
  }
  
  function checkAllForms() {
      let count = 0;
  
      if (isNotEmpty(name.value)) {
          count++;
      }
  
      if (hasNumbers(phone.value)) {
          count++;
      }
  
      if (isNotEmpty(email.value)) {
          count++;
      }
  
      if(isNotEmpty(date.value)) {
          count++;
      }
  
      if(isNotEmpty(fromAddress.value)) {
          count++;
      }
  
      if (isNotEmpty(toAddress.value)) {
          count++;
      }
  
      if (count === 6) {
          return true;
      }
  
  }
  
  function enableBtn() {
      if (checkAllForms()) {
          btn.classList.remove("disabled");
      } else {
          btn.classList.add("disabled");
      }
  }
  
  function sendForm() {
  
  }
  
  // Start by disabling button
  let btn = document.getElementById("submit_btn");
  btn.classList.add("disabled");
  
  // Add event listener to main content area so that validation check is run
  // anytime user clicks anywhere in the main content area.
  document.getElementById("content").addEventListener("click", enableBtn);
  