currency={
'cyp': '1',
'usd': '2.24',
'jpy': '172.83',
'gbp': '1.43',
'eur': '1.71'
};

function currency_convert () {
var currency_form = document.currency_form;
var result = ((currency_form.amount.value / currency[currency_form.from.value]) * currency[currency_form.to.value]);
currency_form.result.value = (Math.round(result*100)/100) + ' ' + currency_form.to.value.toUpperCase();
}