text: function compute() {
      //Get the values and calculate 
      var principal = parseFloat(document.getElementById("principal").value);
      var rate = parseFloat(document.getElementById("rate").value);
      var years = parseInt(document.getElementById("years").value);
      var interest = principal * years * rate / 100;
      var yearInTheFuture = new Date().getFullYear() + years;
      //Create the Interest text
      document.getElementById("result").innerHTML = "If you deposit <mark>$" + principal + "</mark>,<br/>" +
          "at an interest rate of <mark>" + rate + "%</mark>,<br/>" +
          "You will receive an amount of <mark>$" + interest + "</mark>,<br/> " +
          "in the year <mark>" + yearInTheFuture + "</mark>";
  
  }
  
  //update ther ate value
  function getSliderValue() {
      document.getElementById("rateSpan").innerHTML = document.getElementById("rate").value;
  }
  
  //Check for positive values
  function validateAmount() {
      var principal = document.getElementById("principal").value;
      var biggerThanZero = parseInt(principal) > 0;
      if (!biggerThanZero) {
          alert("Enter a positive number");
          document.getElementById("principal").focus();
      }
  
  }
  