function tabit(btn)
{
  var idname = new String(btn.id);
  var s = idname.indexOf("_");
  var e = idname.lastIndexOf("_")+1;
  var tabName = idname.substr(0, s);
  var id = parseInt(idname.substr(e, 1));
  var tabNumber = btn.parentNode.childNodes.length;
  for(i=0;i<tabNumber;i++){
     document.getElementById(tabName+"_div_"+i).style.display = "none";
     document.getElementById(tabName+"_btn_"+i).className = "";
  };
     document.getElementById(tabName+"_div_"+id).style.display = "block";
     btn.className = "curr";
};