AJAX

//---------------------------------------------------------------------------------
// ajax3.js
// retrieves data from files and puts it where you want it
//---------------------------------------------------------------------------------

//Create a boolean variable to check for a valid Internet Explorer instance.
var XmlHttp = false;
// Check if we are using IE.
try {
// If the Javascript version is greater than 5.
XmlHttp = new ActiveXObject("Msxml2.XMLHTTP");

} catch (e) {
// If not, then use the older active x object.
try {
// If we are using Internet Explorer.
XmlHttp = new ActiveXObject("Microsoft.XMLHTTP");

} catch (E) {
// Else we must be using a non-IE browser.
XmlHttp = false;
}// end catch
}// end catch

// If we are using a non-IE browser, create a javascript instance of the object.
if (!XmlHttp && typeof XMLHttpRequest != 'undefined') {
XmlHttp = new XMLHttpRequest();
// degrade gracefully
if (!XmlHttp) {
window.location = 'no_ajax.html';
}
}// end if

// ---------------------------------------------------------------------------------
// function getData
// param fileName (what we are getting)
// param divId (where we are going to put it)
// param outputType value='val' or 'html' depending on output to val or
// innerHtml
// ---------------------------------------------------------------------------------
function getData(fileName, divId, outputType) {

var obj = document.getElementById(divId);
XmlHttp.open("GET", fileName);

XmlHttp.onreadystatechange = function() {
if (XmlHttp.readyState == 4 && XmlHttp.status == 200) {
clearTimeout(xmlHttpTimeout);
if (outputType == 'val') {
obj.value = XmlHttp.responseText;
} else if (outputType == 'html') {
obj.innerHTML = XmlHttp.responseText;
}// end else if
}// end if
;
}// end function

// sends an http request to the server and receives a response
XmlHttp.send(null);
var xmlHttpTimeout=setTimeout(ajaxTimeout,5000);
}// end function

//---------------------------------------------------------------------------------
//function ajaxTimeout
//---------------------------------------------------------------------------------
function ajaxTimeout(){
XmlHttp.abort();
alert('fail');
}//end function