AJAX and PHP

Registration Successfull!<< Go back8. Create a file named validate.js. This file performs the client-side functionality,including the AJAX requests:// holds an instance of XMLHttpRequestvar xmlHttp = createXmlHttpRequestObject();// holds the remote server addressvar serverAddress = "validate.php";// when set to true, display detailed error messagesvar showErrors = true;// initialize the validation requests cachevar cache = new Array();// creates an XMLHttpRequest instancefunction createXmlHttpRequestObject(){// will store the reference to the XMLHttpRequest objectvar xmlHttp;// this should work for all browsers except IE6 and oldertry{// try to create XMLHttpRequest objectxmlHttp = new XMLHttpRequest();}catch(e){// assume IE6 or oldervar XmlHttpVersions = new Array("MSXML2.XMLHTTP.6.0","MSXML2.XMLHTTP.5.0","MSXML2.XMLHTTP.4.0","MSXML2.XMLHTTP.3.0","MSXML2.XMLHTTP","Microsoft.XMLHTTP");// try every id until one worksfor (var i=0; i