var available;function ajaxObject(){if(window.XMLHttpRequest){return new XMLHttpRequest();}else if(window.ActiveXObject){return new ActiveXObject("Microsoft.XMLHTTP");}else{return false;}} function updateDiv(){if(available.readyState==4){var response=available.responseText;document.getElementById('response').innerHTML=response;}} function availability(username){available=ajaxObject();with(available){open("GET","/ajax/php/availability.php?username="+username,true);onreadystatechange=updateDiv;send("");}}