AJAX Browser Support < script type = "text/javascript" > function ajaxFunction () { var xmlhttp ; if ( window . XMLHttpRequest ) { // code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp = new XMLHttpRequest (); } else if ( window . ActiveXObject ) { // code for IE6, IE5 xmlhttp = new ActiveXObject ( "Microsoft.XMLHTTP" ); } else { alert ( "Your browser does not support XMLHTTP!" ); } } </ script >