function createXMLHttpRequest()
{
    // See http://en.wikipedia.org/wiki/XMLHttpRequest
    // Provide the XMLHttpRequest class for IE 5.x-6.x:
    if( typeof XMLHttpRequest == "undefined" ) XMLHttpRequest = function() {
        try {
            return new ActiveXObject("Msxml2.XMLHTTP.6.0")
        } catch(e) {}
        try {
            return new ActiveXObject("Msxml2.XMLHTTP.3.0")
        } catch(e) {}
        try {
            return new ActiveXObject("Msxml2.XMLHTTP")
        } catch(e) {}
        try {
            return new ActiveXObject("Microsoft.XMLHTTP")
        } catch(e) {}
        throw new Error( "This browser does not support XMLHttpRequest." )
    };
    return new XMLHttpRequest();
}

function evalJSON(json)
{
    return eval("(" + json + ")");
}

var captchaIndex = 0;

function captchaClicked()
{
    document.getElementById('captchaImage').src = "/captcha?" + captchaIndex++;
}