Untitled

<html>
<head>
<script>
	function roepPhpFunctieAan() {
		var xmlHttp = null;

		xmlHttp = new XMLHttpRequest();
		var params = "?intensiteit=100";

		xmlHttp.open("GET", "http://localhost/controlled.php" + params, false);
		xmlHttp.onreadystatechange = function() {// Call a function when the state changes.
			if (xmlHttp.readyState == 4 && xmlHttp.status == 200) {
				alert(xmlHttp.responseText);
			}
		}
		xmlHttp.send();
	}
</script>
</head>
<body>

	<button onclick="roepPhpFunctieAan()">Zet aan</button>

</body>
</html>