function requestWord(callback)
{
	postAjax('requestword.php', null, callback);
}

function getScore(callback)
{
	postAjax('updatescore.php', null, callback);
}

function updateScore(win, callback)
{
	var paramstr = null;
	if(win)
		paramstr = "win=1";
	else
		paramstr = "win=0";
	postAjax('updatescore.php', paramstr, callback);
}

function postAjax(page, paramstr, callback)
{
	var http = new XMLHttpRequest();
	if (http.overrideMimeType)
		http.overrideMimeType('text/xml');
	http.open('POST', page, true);
	http.setRequestHeader('Content-Type', 
	  'application/x-www-form-urlencoded');
	http.onreadystatechange = function(){ callback(http); };
	http.send(paramstr);	
}