<script>

function lang_mouseover(obj){

var path = String(window.location);

var re = /l=/;

if(!re.test(path)){

obj.href=path+'&l='+obj.id;

}else{

obj.href=path.replace(/l=\w{2}(-[a-z]{2})?/g,'l='+obj.id);

}

}

</script>

<a href="#" class="lang" id="zh-cn" οnmοuseοver="lang_mouseover(this)">中文</a> | <a href="#" class="lang" id="en" οnmοuseοver="lang_mouseover(this)">English</a>