Untitled

<!Doctype html>
<html>
<head>
<meta charset="utf-8">
<script src="js.js"></script>
</head>
<body>
<form name="f1">
<input type="text" name="zm">
<button onClick="spr()">Sprawdź</button>
</form>
<div id="wynik"></div>
</body>
</html>


function spr(){
	var x=parseInt(f1.zm.value);
	alert(x);
}