Как вариант...
<!Doctype html>
<html>
<head>
<title>Taskai</title>
<meta charset="utf-8">
<script>
function taskai(){
var a = +prompt("iveskite skaiciu");
document.getElementById("taskas").innerHTML = 'Taskai: '+a;
}
</script>
</head>
<body>
<input type="button" id="mygtukas" value="Taskai" onclick="taskai()"></input>
<div id="taskas"></div>
</body>
</html>
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