var gotGamertag;

function getHalocard(gamertag) {
    var xmlHttp;
    
    try {  // Firefox, Opera 8.0+, Safari  
        xmlHttp=new XMLHttpRequest();  
    }
    catch (e) {  // Internet Explorer
        try {
            xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
        }
        catch (e) {
            try {
                xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
            }
            catch (e) {
                alert("Your browser does not support AJAX.  That's bad.");
            }
        }
    }
    xmlHttp.onreadystatechange=function()
    {
        if(xmlHttp.readyState==4) {
            if (xmlHttp.responseText.replace("Gamertag not found.", "") == xmlHttp.responseText) {
                gotGamertag = true;
            }
            else {
                gotGamertag = false;
            }
            gotHalocard(xmlHttp.responseText);
        }
    }
    xmlHttp.open("GET","halocard.aspx?&gamertag=" + gamertag, true);
    xmlHttp.send(null);
}