snippet - ajax...

gistfile1.js

var loadXMLDoc = (function () {
  var xmlhttp;

  if (window.XMLHttpRequest) {
    // code for IE7+, Firefox, Chrome, Opera, Safari
    xmlhttp = new XMLHttpRequest();
  }
  else { // code for IE6, IE5
    xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
  }

  xmlhttp.onreadystatechange = (function () {
    if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
      document.getElementById("myDiv")
        .innerHTML = xmlhttp.responseText;
    }
  })

  xmlhttp.open("GET", "", true);
  xmlhttp.send();
});​