ajax

function loadXMLDoc(){
var xmlhttp;
if (window.XMLHttpRequest) {
xmlhttp = new XMLHttpRequest()
} else {
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP")
}
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
document.getElementById("myDiv").innerHTML = xmlhttp.responseText
}
}
xmlhttp.open("GET", "demo_get.php", true);
xmlhttp.send();
}