var cost = 1000;
function Workoutsalary() {
// get value
var currentsalary = document.getElementById("mysalary");
var currently = eval (currentsalary.value);
var tenpercent = eval (currently/10);
//alert (tenpercent);
var timetileven = 1000 / tenpercent;
timetileven = eval (timetileven);
//var timetileven = Math.floor(timetileven);

var newsalary = eval("currently + tenpercent");
//alert (timetileven);
var twentyyears = tenpercent * 20;
//alert (tenyears);
if (timetileven > 1) { var theyears = "years"; } else { var theyears = "year"; }
if (timetileven < 1) { timetileven = "less than one "} else {
timetileven = Math.round(timetileven); }

var thistotal = document.getElementById("showresults");
var updatepage = "Your current salary is £" + currently + ".<br><BR>After a 10% increase your salary will become: £" + newsalary + ".<br><br>It will take " + timetileven + " " + theyears + " to pay in full for our careers mentoring service.<br><br>Over the course of twenty years, your total additional increase in earnings - based on just a one off 10% increase - would be: £<b>" + twentyyears +"</b>";
thistotal.innerHTML = updatepage;
}