// JavaScript Document

function validate_form(fname){
	var emailaddress = fname.emailaddress;
	
	if (!validate_email(emailaddress.value)){
		emailaddress.focus();
		return false;
	}  else {
		sendRequest(emailaddress.value);	
	}
}

function validate_email(emailtxt){

	apos=emailtxt.indexOf("@");
	dotpos=emailtxt.lastIndexOf(".");
	
	if (apos<1||dotpos-apos<2){
		alert("Please enter a valid email address");
		return false;
	} else {
		return true;
	}
}



//




function createRequestObject() {
	
   var req;

   if(window.XMLHttpRequest){
      // Firefox, Safari, Opera...
      req = new XMLHttpRequest();
   } else if(window.ActiveXObject) {
      // Internet Explorer 5+
      req = new ActiveXObject("Microsoft.XMLHTTP");
   } else {
      // There is an error creating the object,
      // just as an old browser is being used.
      alert('Problem creating the XMLHttpRequest object');
   }

   return req;

}

// Make the XMLHttpRequest object
var http = createRequestObject();

function sendRequest(emailaddress) {
	//alert(emailaddress);
	 document.getElementById("ajaxArea").innerHTML = "<img src=\"/images/loading.gif\" />";
   // Open PHP script for requests
   http.open('get', '/inc/ajax_email.php?emailaddress='+emailaddress);
   http.onreadystatechange = handleResponse;
   http.send(null);

} 

function handleResponse() {
	//alert(http.readyState);
   if(http.readyState == 4 && http.status == 200){

      // Text returned FROM the PHP script
      var response = http.responseText;

      if(response) {
		  
		  if(response == 'ok'){
			   document.getElementById("ajaxArea").innerHTML = "Thankyou, we have added you to our subscription list";
		  } else {
			   document.getElementById("ajaxArea").innerHTML = "Sorry, there has been an error. Please try again later.";  
		  }
 
        
      }
	   
  } 
}