Inténtalo tú mismo - php ajax

PHP Source:

<!DOCTYPE html>
<html>
<head>
<script>
function showUser(str) {
� if (str=="") {
� � document.getElementById("txtHint").innerHTML="";
�� return;
� }
� if (window.XMLHttpRequest) {
�� // code for IE7+, Firefox, Chrome, Opera, Safari
� � xmlhttp=new XMLHttpRequest();
� } else { // code for IE6, IE5
� � xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
� }
� xmlhttp.onreadystatechange=function() {
� � if (xmlhttp.readyState==4 && xmlhttp.status==200) {
� �� document.getElementById("txtHint").innerHTML=xmlhttp.responseText;
�� }
� }
� xmlhttp.open("GET","getuser.php?q="+str,true);
� xmlhttp.send();
}