function   HideMenu1() {  
  document.all("dht1").style.display   =   "none"   
}
    
  function   ShowMenu1(){       
    
  document.all("dht1").style.display   =   "block"   
}

  function   HideMenu2() {  
  document.all("dht2").style.display   =   "none"   
}
    
  function   ShowMenu2(){       
    
  document.all("dht2").style.display   =   "block"   
}

  function   HideMenu3() {  
  document.all("dht3").style.display   =   "none"   
}
    
  function   ShowMenu3(){       
    
  document.all("dht3").style.display   =   "block"   
}

  function   HideMenu4() {  
  document.all("dht4").style.display   =   "none"   
}
    
  function   ShowMenu4(){       
    
  document.all("dht4").style.display   =   "block"   
}