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', 'test.php?id='
	  + document.form_select.select_select.selectedIndex);
	
	http.onreadystatechange = handleInfo;
	
	http.send(null);
}
function changeDisplay(arg_id)
{
  if (document.getElementById(arg_id)) {
	 if (document.getElementById(arg_id).style.display == "none") {
		document.getElementById(arg_id).style.display = "block";
	 } 
	 else if (document.getElementById(arg_id).style.display == "block") {
		document.getElementById(arg_id).style.display = "none";
	 }
  }
}
function handleInfo(){
	if(http.readyState == 1){
	 document.getElementById('my_div').innerHTML = 'Loading...';
	}
	if(http.readyState == 4){
	 var response = http.responseText;
	 document.getElementById('my_div').innerHTML = response;
	}
}