bigi,
function calc() {
var d = +document.getElementById('dol').value;
var s = +document.getElementById('sum').value;
var k = 0;
if (isNaN(s)) {
s = 0;
} else if (d == 1) {
if (s >= 400000) k = 0.024;
else if (s >= 350000) k = 0.023;
else if (s >= 300000) k = 0.022;
else if (s >= 250000) k = 0.016;
else if (s >= 200000) k = 0.010;
} else if (d == 2) {
} else if (d == 3) {
} else if (d == 4) {
} else if (d == 5) {
}
document.getElementById('rezult').textContent = parseInt(s * k);
}