yunis91,
<!DOCTYPE HTML>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
<script>
$(document).ready(function () {
var maxPrice = 0,
val = 0;
$radiog = $('[name="radiog_infoprod"]');
$('[name="radiog_infoprod"]').on("change", function () {
maxPrice = +this.value;
maxPrice = val > maxPrice ? val - maxPrice : 0;
$("#resultViq").html(maxPrice);
val = +this.value
})
});
</script>
</head>
<body>
<div class="col-lg-4 col-md-4 col-xs-12 col-sm-4 ">
<div class="infoprodukt">
<img src="img/disk.png">
</div>
<h3 class="infoprodukt-podis">CD-диск</h3>
<div class="radio">
<input type="radio" name="radiog_infoprod" id="radio1" class="css-checkbox" checked="checked" value="1299" >
<label for="radio1" class="css-label">1299 руб.</label>
</div>
</div>
<div class="col-lg-4 col-md-4 col-xs-12 col-sm-4 ">
<div class="infoprodukt">
<img src="img/flash.png">
</div>
<h3 class="infoprodukt-podis">Флэш-карта</h3>
<div class="radio">
<input type="radio" name="radiog_infoprod" id="radio2" class="css-checkbox" value="1799">
<label for="radio2" class="css-label">1799 руб.</label>
</div>
</div>
<div class="col-lg-4 col-md-4 col-xs-12 col-sm-4 ">
<div class="infoprodukt">
<img src="img/onlinedown.png">
</div>
<h3 class="infoprodukt-podis">Онлайн скачивание</h3>
<div class="radio">
<input type="radio" name="radiog_infoprod" id="radio3" class="css-checkbox" value="799">
<label for="radio3" class="css-label">799 руб.</label>
</div>
</div>
.....
<h4>ваша выгода <span id="resultViq">0</span> руб.</h4>
</body>
</html>