var xmlHttp;
			
			function createRequest(){
				if(window.ActiveXObject){
					xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
				}
				else if(window.XMLHttpRequest){
					xmlHttp = new XMLHttpRequest();
				}
			}
			
			function subscribe() {
				var email = document.getElementById('email').value;
				
				if (email.indexOf("@") < 1)
				{
					alert("Please input a valid email address!")
					
				} else {
					createRequest();
					var url = "subscribe.php?email=" + encodeURIComponent(email);
					xmlHttp.open("GET", url, true);
					xmlHttp.onreadystatechange = StateChange;
					xmlHttp.send(null);
				}

			}
			
					
			function StateChange(){
			
				if(xmlHttp.readyState == 4){
						alert(xmlHttp.responseText);
						document.getElementById('email').value = "Enter your email";

				} 
			}