function tabit(tabName,btnId,tabNumber)
 {
     for(i=0;i<tabNumber;i++)
  {
  document.getElementById(tabName+"_xm"+i).style.display = "none";
  document.getElementById(tabName+"_qyqh"+i).className = tabName+"off";
  }
  document.getElementById(tabName+"_xm"+btnId).style.display = "block";
  document.getElementById(tabName+"_qyqh"+btnId).className = tabName+"on";
 }