The AJAX JavaScript

This is the JavaScript code, stored in the file clienthint.js:

var xmlhttp

function showHint(str)

{

if (str.length==0)

 {

 document.getElementById("txtHint").innerHTML="";

 return;

 }

xmlhttp=GetXmlHttpObject();

if (xmlhttp==null)

 {

 alert ("Your browser does not support XMLHTTP!");

 return;

 }

var url="gethint.asp";

url=url+"?q="+str;

url=url+"&sid="+Math.random();

xmlhttp.onreadystatechange=stateChanged;

xmlhttp.open("GET",url,true);

xmlhttp.send(null);

}

function stateChanged()

{

if (xmlhttp.readyState==4)

 {

 document.getElementById("txtHint").innerHTML=xmlhttp.responseText;

 }

}

function GetXmlHttpObject()

{

if (window.XMLHttpRequest)

 {

 // code for IE7+, Firefox, Chrome, Opera, Safari

return new XMLHttpRequest();

 }

if (window.ActiveXObject)

 {

 // code for IE6, IE5

 return new ActiveXObject("Microsoft.XMLHTTP");

 }

return null;

}