Ajax form check (Opgelost)

	function check_field($input, $field) {
		if (strlen($input) < 3) {
			global $error, $send;
			$msg = "Your ".$field." should be atleast 3 characters long.";
			$error .= "<br>* ".$msg;
			$send = false;
			return $msg;
		}
		else {
			$msg = "This field is filled in correctly.";
			return $msg;
		}
	}
	if ($_POST['ajax'] == "true") {
		echo check_field($_POST['input'], $_POST['field']);
	}
	elseif ($_POST['send'] == "true") {

function check_field($input, $field) {
		if (strlen($input) < 3) {
			global $error, $send;
			$msg = "Your ".$field." should be atleast 3 characters long.";
			$error .= "<br>* ".$msg;
			$send = false;
			return $msg;
		}
		else {
			$msg = "This field is filled in correctly.";
			return $msg;
		}
	}
	if ($_POST['ajax'] == "true") {
		echo check_field($_POST['input'], $_POST['field']);
	}
	elseif ($_POST['send'] == "true") {

function newRequest() {
	var req;
	if (window.XMLHttpRequest) {
		req = new XMLHttpRequest();
	}
	else if (window.ActiveXObject) {
		req = new ActiveXObject("Microsoft.XMLHTTP");
	}
	else {
		alert('Problem creating the XMLHttpRequest object');
	}
	return req;
}
function CheckField(query, name) {
	http = newRequest();
	http.open('POST', '/Steven/contact.php', true);
	http.onreadystatechange = ShowValidation(name);
	http.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");    
	http.send(query);
} 
function ShowValidation(name) {
	if (http.readyState == 4 && http.status == 200) {
		document.getElementById('valid'+name).innerHTML = http.responseText;
	}
}

function newRequest() {
	var req;
	if (window.XMLHttpRequest) {
		req = new XMLHttpRequest();
	}
	else if (window.ActiveXObject) {
		req = new ActiveXObject("Microsoft.XMLHTTP");
	}
	else {
		alert('Problem creating the XMLHttpRequest object');
	}
	return req;
}
function CheckField(query, name) {
	http = newRequest();
	http.open('POST', '/Steven/contact.php', true);
	http.onreadystatechange = ShowValidation(name);
	http.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");    
	http.send(query);
} 
function ShowValidation(name) {
	if (http.readyState == 4 && http.status == 200) {
		document.getElementById('valid'+name).innerHTML = http.responseText;
	}
}

<?php
	session_start();
	include("Steven/dbconnect.php");
	include("Steven/functions.php");
?>

<?php
	session_start();
	include("Steven/dbconnect.php");
	include("Steven/functions.php");
?>