var mh = 30;//最小高度
var step = 10;//每次变化的px量
var ms = 1;//每隔多久循环一次
function toggle(o){
  if (!o.tid)o.tid = "_" + Math.random() * 100;
  if (!window.toggler)window.toggler = {};
  if (!window.toggler[o.tid]){
    window.toggler[o.tid]={
      obj:o,
      maxHeight:o.offsetHeight,
      minHeight:mh,
      timer:null,
      action:1
    };
  }
  o.style.height = o.offsetHeight + "px";
  if (window.toggler[o.tid].timer)clearTimeout(window.toggler[o.tid].timer);
  window.toggler[o.tid].action *= -1;
  window.toggler[o.tid].timer = setTimeout("anim('"+o.tid+"')",ms );
}
function anim(id){
  var t = window.toggler[id];
  var o = window.toggler[id].obj;
  if (t.action < 0){
    if (o.offsetHeight <= t.minHeight){
      clearTimeout(t.timer);
      document.getElementById("titlekey").innerText="展开此栏";
      return;
    }
  }
  else{
    if (o.offsetHeight >= t.maxHeight){
      clearTimeout(t.timer);
	  document.getElementById("titlekey").innerText="收缩此栏";
      return;
    }
  }
  o.style.height = (parseInt(o.style.height, 10) + t.action * step) + "px";
  window.toggler[id].timer = setTimeout("anim('"+id+"')",ms );
}