<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<link href="style.css" href="text/css" rel="stylesheet">
</head>
<body>
<form id="formone" action="data.js" method="post">
<p>First number</p><input type="number" id="a" name="fnumber" />
<p>Second nubmer</p><input type="number" id="b" name="snumber" />
<div id="wynik"></div>
<input type="button" value="DODAWANIE" id="dod" class="button1" onclick="oblicz()">
<input type="button" value="ODEJMOWANIE" id="odej" class="button1">
<input type="button" value="MNOZENIE" id="mno" class="button1">
<input type="button" value="DZIELENIE" id="dziel" class="button1">
<div style="clear:both"></div>
<script>
function oblicz(a, b){
var a = document.getElementById('a').value;
var b = document.getElementById('b').value;
a = parseFloat(a);
b = parseFloat(b);
document.getElementById("wynik").innerHTML = "Wynik działania wynosi: " + (a + b);
break;
}
</script>
</body>
</html>