function topxiala(){
 d=document.getElementById("topzhezhao");
 if(d.style.display=="block"){
 document.getElementById("topzhezhao").style.display="none";
 document.getElementById("topxialam").style.display="none";
 }else{
 document.getElementById("topzhezhao").style.display="block";
 document.getElementById("topxialam").style.display="";
 }
}