function $(obj){return document.getElementById(obj);}
function $F(obj){return document.getElementById(obj).value;}
function showObj(id){document.getElementById(id).style.display="";}
function hiddenObj(id){document.getElementById(id).style.display="none";}
function classObj(id,classneme){document.getElementById(id).className=classneme;}


function current(id){

}

//显示
function currentCertificate(id){
  document.getElementById(id+"_img").src="/images/"+id+"1.png";
  hiddenObj("VeriSign");hiddenObj("GeoTrust");hiddenObj("Thawte");
  //hiddenObj("GlobalSign");
  showObj(id);
}
//隐藏
function hiddenCertificate(id){
  document.getElementById(id+"_img").src="/images/"+id+"2.png";
}