AJAX and PHP

header('Expires: Fri, 25 Dec 1980 00:00:00 GMT'); // time in the pastheader('Last-Modified: ' . gmdate( 'D, d M Y H:i:s') . 'GMT');header('Cache-Control: no-cache, must-revalidate');header('Pragma: no-cache');header('Content-Type: text/html');// execute the client request and return the updated tasks listecho $myTasksList->Process($content, $action);?>9. Create a new file named drag-and-drop.js, and add this code to it:// holds an instance of XMLHttpRequestvar xmlHttp = createXmlHttpRequestObject();// when set to true, display detailed error messagesvar showErrors = true;// initialize the 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 prog id until one worksfor (var i=0; i