function calc()
{
	var price = document.getElementById('price').value;
	var srok = document.getElementById('srok').value;

	price = price*1;
	if (price > 150000) alert('Сумма не должна превышать 50000 грн.');

	else if (price >= 3000)
	{
	if (srok == 1)
		var p = 29.63;
	else if (srok == 2)
		var p = 59.26;
	else if (srok == 3)
		var p = 88.89;
	var res = p*price/100;
	res = price*1+res*1;
	if (srok == 1)
		res = res/12;
	else if (srok == 2)
		res = res/24;
	else if (srok == 3)
		res = res/36;
	var buf = document.getElementById('res');
	buf.value = Math.round(res)+" грн./мес";
	}

}