// 显示隐藏友情链接申请
function changlink(id_num){
           var oa = document.getElementById(id_num);//特别注意这里的大小写变化
           var ob = document.getElementById("linkhide-a");
           if(oa.style.display == "none"){
                   oa.style.display = "block";
                   ob.innerHTML = "[-]申请链接";
           }else{
                   oa.style.display = "none";
                   ob.innerHTML = "[+]申请链接";
           }
           return false;
}