function grade(userFollow) {

	// Mozilla version

	if (window.XMLHttpRequest) {

		xhr = new XMLHttpRequest();

	}

	// IE version

	else if (window.ActiveXObject) {

		xhr = new ActiveXObject("Microsoft.XMLHTTP");

	}

	userFollow=encodeURIComponent(userFollow);

	xhr.open("POST","js/follow.php");

	xhr.setRequestHeader(

		'Content-Type',

		'application/x-www-form-urlencoded; charset=UTF-8');

	xhr.send(userFollow);

	xhr.onreadystatechange=function() {

		if (xhr.readyState==4) {
			field = xhr.responseText;
			document.getElementById(field).style.background = "url('images/following.png')";
		}
	}

	return false;

}