function changeLanguage(obj) { 
    var url = document.URL; 
    var re = re = /[?&]language=[^&]*/; 
    url = url.replace(re, ""); 

	if (url.indexOf("lang") > -1) { //如果已经进行了语言选择
		
			if (url.indexOf("?") > -1) { 
				url = url.substring(0,url.length-5)+obj.value; 
			} else { 
				url = url.substr(0,url.length-5)+obj.value;
			} 
		
	}
	else
		{
			if (url.indexOf("?") > -1) { 
				url += "&lang=" + obj.value; 
			} else { 
				url += "?lang=" + obj.value; 
			} 
	}

    location.href = url; 
}