text: function compute()
  {
      var principal = document.getElementById("principal").value;
      if(principal<=0){
          alert("Enter a positive number");
          fname.focus();
          return false;
          }
      var rate = document.getElementById("rate").value;
      var years = document.getElementById("years").value;
      var interest = principal * years * rate /100;
      var year = new Date().getFullYear()+parseInt(years);
  
      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>"+year+"</mark><br/>"
  
  }
  
  function updateRate() 
  {
      var rateval = document.getElementById("rate").value;
      document.getElementById("rate_val").innerText=rateval;
  }
  