function salaryCalc() {
	var s = document.salary.annual;
	var h = document.salary.hourly;
	var salary = s.value;
	if (!salary || isNaN(salary)) {
		alert('Please enter your annual salary in the field provided rounded to the nearest whole Euro amount using only numbers.');
		s.focus();
		return false;
	}
	var hourly = Math.round(((salary/52.18)/37)*100)/100;
	h.value = hourly;
	return false;
}