var http = getHTTPObject(); // create the HTTP Object
var request_isbn = "reqISBN.php?task=";

function init ()
{
   document.getElementById ('isbn').focus();
}

function newISBN ()
{
   var isbn = document.getElementById ('isbn').value;
   var form = '';

   if (document.getElementById ('AMAForm').checked) {
      form= 'AMA';
   } else if (document.getElementById ('APAForm').checked) {
      form = 'APA';
   } else if (document.getElementById ('ChiForm').checked) {
      form = 'Chi';
   } else if (document.getElementById ('MLAForm').checked) {
      form= 'MLA';
   } else if (document.getElementById ('TuraForm').checked) {
      form='Tura';
   }

	http.open("GET", request_isbn + "fetchISBN" + "&isbn=" + escape(isbn) + "&form=" + escape (form), true); 
	http.onreadystatechange = handleISBN; 
	http.send(null);
}

function handleISBN ()
{
  	if (http.readyState == 4) 
	{
	   document.getElementById ('citation').innerHTML = http.responseText; 
   }
}