function setLang(lang)
{
		var ajax = initAjax();
		ajax.open('GET','/lang/?lang='+lang+'&random='+Math.random(),true);
		ajax.onreadystatechange = function()
		{
			if(ajax.readyState == 4 && ajax.status == 200)
			{
				if(ajax.responseText){
					window.location.href = window.location.href;	
				}else{
					alert('选择语言失败！');
					return;
				}
			}
		}
		ajax.send(null);
}