function ajExec(url, param, callback, isXML) {
    var req = new XMLHttpRequest();
    req.onreadystatechange = function() {
        if (req.readyState == 4 && req.status == 200) {
            if(!isXML && req.responseText != null)
                callback(req.responseText);
            else if(isXML && req.responseXML != null)
                callback(req.responseXML);
            else
                callback(null);
        } else if (req.readyState == 4 && req.status != 200) {
 
            var err = "Error: "+req.status;
            alert(err);
            callback(err);
        }
    }
        req.open("POST", url, true);
        req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
        req.send(param);
 
}

function sendButtonClicked(event) {
     saved_username = widget.preferenceForKey("username");
	 saved_pass = widget.preferenceForKey("pass_s");
	 saved_tags = widget.preferenceForKey("tag");
	 saved_server = widget.preferenceForKey("server");
	 pub = blogField.getText();
 
	ajExec(saved_server,'<?xml version="1.0" encoding="UTF-8"?><methodCall><methodName>metaWeblog.newPost</methodName><params><param><value><string>MyBlog</string></value></param><param><value><string>'+saved_username+'</string></value></param><param><value><string>'+saved_pass+'</string></value></param><value><struct><member><param><name>title</name><value><string>This is a post</string></value></param></member><member><param><name>description</name><value><string>'+pub+'</string></value></param></member></struct></value><param><value><boolean>1</boolean></value></param></params></methodCall>',showAnswer,1);
}
}