<html>
<head>
<script type="text/javascript" charset="utf-8" src="js/jquery-1.7.2.min.js"></script>
</head>
<body>

<select name="sweets" id="select">
  <option value="1" selected="selected">1</option>
  <option value="2">2</option>
  <option value="3">3</option>
  <option value="4">4</option>
</select>

<select name="sweets" id="type">
  <option value="cr" selected="selected">Kr</option>
  <option value="ekr">Ekr</option>
</select>


<br /><br /><br /><br /><br /><br />

<div>
Цена 1 - <span id="1">0</span><br />
Цена 2 - <span id="2">0</span><br />
Цена 3 - <span id="3">0</span><br />
</div>
<script>
var exp_cr_5 = [10500, 2, 4];
var exp_cr_10 = [100, 500];
var exp_cr_15 = [100, 500];
var exp_cr_20 = [100, 500];

for(var ind = 0; ind < 3; ind++) {
  var s[ind] = check_sum(exp_cr_5[1], exp_cr_5[2]);
}

function process_rune(type, level) {
  var s_1 = check_sum(exp_cr_5[1], exp_cr_5[2]);
  $("#1").text(s_1+' = '+wins(exp_cr_5[0], s_1));
}

function check_sum(koef_1, koef_2) {
  
  var summ_180 = 22*koef_1;
  var summ_360 = 30*koef_2;
  var summ_all = summ_180+summ_360;
  return summ_all;
}


function wins(exp, level) {
  var r = exp/level;
  return r;
}

$("#select").change(function () {
  process_rune(1, 1);
});
</script>

</body>
</html>