function $A(element) {
  return document.getElementById(element);
}
//切屏--是按钮，_v是内容平台，_h是内容库
function reg(str){
  var bt=$A(str+"_b").getElementsByTagName("h6");
  for(var i=0;i<bt.length;i++){
    bt[i].subj=str;
    bt[i].pai=i;
    bt[i].style.cursor="pointer";
    bt[i].onmouseover=function(){
      $A(this.subj+"_v").innerHTML=$A(this.subj+"_h").getElementsByTagName("blockquote")[this.pai].innerHTML;
      for(var j=0;j<$A(this.subj+"_b").getElementsByTagName("h6").length;j++){
        var _bt=$A(this.subj+"_b").getElementsByTagName("h6")[j];
        var ison=j==this.pai;
        _bt.className=(ison?"":"h6bg");
      }
    }
  }
  $A(str+"_h").className="none";
  $A(str+"_v").innerHTML=$A(str+"_h").getElementsByTagName("blockquote")[0].innerHTML;
}