function echeck(str) {
	var at="@"
	var dot="."
	var lat=str.indexOf(at)
	var lstr=str.length
	var ldot=str.indexOf(dot)
	if (str.indexOf(at)==-1){
	    return false
	}
	
	if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
	     return false
	}
	
	if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		return false
	}
	
	 if (str.indexOf(at,(lat+1))!=-1){
		return false
	 }
	
	 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		return false
	 }
	
	 if (str.indexOf(dot,(lat+2))==-1){
		return false
	 }
	
	 if (str.indexOf(" ")!=-1){
		return false
	 }
	 return true					
}

/* ---------------------------- */
/* XMLHTTPRequest Enable */
/* ---------------------------- */
function createObject() {
var request_type;
var browser = navigator.appName;
if(browser == "Microsoft Internet Explorer"){
request_type = new ActiveXObject("Microsoft.XMLHTTP");
}else{
request_type = new XMLHttpRequest();
}
return request_type;
}

var http = createObject();

/* -------------------------- */
/* INSERT */
/* -------------------------- */
/* Required: var nocache is a random number to add to request. This value solve an Internet Explorer cache issue */
var nocache = 0;
function insert() {
	
	// Optional: Show a waiting message in the layer with ID login_response
document.getElementById('insert_response').innerHTML = "Please wait.."
// Required: verify that all fileds is not empty. Use encodeURI() to solve some issues about character encoding.
var email= encodeURI(document.getElementById('email').value);
if(email=='') {
	document.getElementById('insert_response').innerHTML = "Please Enter Email";
} else {
	var valid = echeck(email);
	if(valid == true) {
	//alert(valid);
// Set te random number to add to URL request
	nocache = Math.random();
	
// Pass the login variables like URL variable
	http.open('get', 'insert.php?email='+email+'&nocache = '+nocache);
	http.onreadystatechange = insertReply;
	http.send(null);
	} else {
	document.getElementById('insert_response').innerHTML = "Invalid Email";
	}
} 
function insertReply() {
	if(http.readyState == 4){
		var response = http.responseText;
		document.getElementById('insert_response').innerHTML = 'Sucessfully subscribed'+response;
		document.getElementById('email').value='';
		}
	}
}