function createRequestObject(){
var request_;
var browser = navigator.appName;
if(browser == "Microsoft Internet Explorer"){
 request_ = new ActiveXObject("Microsoft.XMLHTTP");
}else{
 request_ = new XMLHttpRequest();
}
return request_;
}
var http = createRequestObject();
function getInfo(){
http.open('get', 'custom_messages.php?display_order=' + document.form_select.select_select.selectedIndex);

http.onreadystatechange = handleInfo;

http.send(null);
}
function handleInfo(){
if(http.readyState == 1){
 document.getElementById('custom_messages').innerHTML = 'Loading...';
}
if(http.readyState == 4){

 var response = http.responseText;

 document.getElementById('custom_messages').innerHTML = response;
}
}