// JavaScript Document
var req;
var target;
var isIE;

function validate_email() {
	var at=document.getElementById("friend").value.indexOf("@");
	var dot=document.getElementById("friend").value.lastIndexOf(".");
	var receiver=document.getElementById("sendername").value;
	submitOK="true";
	if (receiver ==''){
		document.getElementById("sendername_error").innerHTML = "Please enter name";
		submitOK="false";
	}
	else{
		document.getElementById("sendername_error").innerHTML = "";
	}
	if (at==-1||dot-at<2) {
		document.getElementById("friend_error").innerHTML = "Invalid email address";
		submitOK="false";
	}
	else{
		document.getElementById("friend_error").innerHTML = "";
	}
	if (submitOK=="false") {
		return false;
	}
	else{
		return true;
		}
		
		/*var poststr ="name="+encodeURI(document.getElementById("sendername").value)+"&email="+encodeURI(document.getElementById("friend").value);
		var url = "scripts/form.php" + "?" + poststr;
		initRequest(url);
		req.onreadystatechange = processRequest;
    	req.open("POST", url, true);
    	req.send(null);*/
	
	
function initRequest(url) {
    if (window.XMLHttpRequest) {
        req = new XMLHttpRequest();
    	} 
		else if (window.ActiveXObject) {
        	isIE = true;
        	req = new ActiveXObject("Microsoft.XMLHTTP");
    	}
	}

function processRequest() {
    if (req.readyState == 4) {
        if (req.status == 200) {
 			var message = http_request.responseText;
            setMessageUsingInline(message);
            var submitBtn = document.getElementById("submit_friend");
            submitBtn.disabled = true;
            }
    	}
	}

function setMessageUsingInline(message) {
    mdiv = document.getElementById("userIdMessage");
    mdiv.innerHTML = message;
   	}
}