function getxmlhttp() {
    //Create a boolean variable to check for a valid IE 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 IE.
            xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
        } catch (E) {
            //Else we must be using a non-IE browser.
            xmlhttp = false;
        }
    }
 
    //If we are using a non-IE browser, create a JavaScript instance of the object.
    if (!xmlhttp && typeof XMLHttpRequest != 'undefined') {
        xmlhttp = new XMLHttpRequest();
    }
 
    return xmlhttp;
}
[/code/