Hello everyone, Im really really new to Javascript but Ive got this script that loads the contents of a url and everything works fine. I call the plannerSpin function with an onClick method on a button but how would I go about displaying an animated gif whilst all this is going on?

var xmlHttp
function plannerSpin(str) {
    xmlHttp = GetXmlHttpObject()
    if (xmlHttp == null) {
        alert("Browser does not support HTTP Request")
        return
    }
    var url = "/recipes/planner/data"
    xmlHttp.onreadystatechange = stateChanged
    xmlHttp.open("GET", url, true)
    xmlHttp.send(null)
}
function stateChanged() {
    if (xmlHttp.readyState == 4 || xmlHttp.readyState == "complete") {
        document.getElementById("recipe_planner_container").innerHTML = xmlHttp.responseText
    }
}
function GetXmlHttpObject() {
    var xmlHttp = null;
    try {
        // Firefox, Opera 8.0+, Safari
        xmlHttp = new XMLHttpRequest();
    } catch (e) {
        // Internet Explorer
        try {
            xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
        } catch (e) {
            xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
        }
    }
    return xmlHttp;
}