script.js

function compute()
{
    var principal = document.getElementById("principal").value;
    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);
	
	if (principal <= 0) {
		alert ("Please, the Amount should be more than 0");
		document.getElementById("principal").focus();
		
	}else {
	var amount = (principal*(rate/100))*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>"+
		amount+"</mark>,<br>in the year <mark>"+year+"</mark><br>"
	}
}

function updateRate(){
    var rateval = document.getElementById("rate").value;
    document.getElementById("rate_val").innerText=rateval;
	}