function clean ()
{
 
 if (navigator.appVersion.charAt (0)<'5')
    {
    var layers=document.all.tags ("div");
    }
    else {
    var layers=document.getElementsByTagName("div");
    }
 layers[0].style.visibility='hidden'; 
 layers[1].style.visibility='hidden';
 layers[2].style.visibility='hidden';
  layers[3].style.visibility='hidden'; 
 layers[4].style.visibility='hidden';
layers[5].style.visibility='hidden';
layers[6].style.visibility='hidden';
layers[7].style.visibility='hidden';
layers[9].style.visibility='hidden';
 return;
}

function menu (i)
{

switch(i)
 {
  case 1:
   
   {
    
    if (navigator.appVersion.charAt (0)<'5')
    {
    var layers=document.all.tags ("div");
    }
    
    else {
    var layers=document.getElementsByTagName("div");
    }
    
   
    layers[0].style.visibility='visible';
   layers[1].style.visibility='visible';
   layers[2].style.visibility='visible';
   layers[3].style.visibility='hidden';
   layers[4].style.visibility='hidden';
   layers[5].style.visibility='hidden';
   layers[6].style.visibility='hidden';
     layers[7].style.visibility='hidden';
     layers[9].style.visibility='hidden';
    return;
    
    
   }
  case 2:
   {
    
    if (navigator.appVersion.charAt (0)<'5')
    {
    var layers=document.all.tags ("div");
    }
    else {
    var layers=document.getElementsByTagName("div");
    }
    layers[0].style.visibility='visible';
   layers[1].style.visibility='visible';
   layers[2].style.visibility='hidden';
   layers[3].style.visibility='visible';
   layers[4].style.visibility='hidden';
   layers[5].style.visibility='hidden';
   layers[6].style.visibility='hidden';
     layers[7].style.visibility='hidden';
     layers[9].style.visibility='hidden';
   
    return;
   }
  case 3:
   {
    
    if (navigator.appVersion.charAt (0)<'5')
    {
    var layers=document.all.tags ("div");
    }
    else {
    var layers=document.getElementsByTagName("div");
    }
    layers[0].style.visibility='visible';
    layers[1].style.visibility='visible';
    layers[2].style.visibility='hidden';
    layers[3].style.visibility='hidden';
    layers[4].style.visibility='visible';
    layers[5].style.visibility='hidden';
    layers[6].style.visibility='hidden';
    layers[7].style.visibility='hidden';
    layers[9].style.visibility='hidden';
   
    return;
   }
   case 4:
   {
    
    if (navigator.appVersion.charAt (0)<'5')
    {
    var layers=document.all.tags ("div");
    }
    else {
    var layers=document.getElementsByTagName("div");
    }
    layers[0].style.visibility='visible';
    layers[1].style.visibility='visible';
    layers[2].style.visibility='hidden';
    layers[3].style.visibility='hidden';
    layers[4].style.visibility='hidden';
    layers[5].style.visibility='visible';
    layers[6].style.visibility='hidden';
    layers[7].style.visibility='hidden';
    layers[9].style.visibility='hidden';
   
    return;
   }
    case 5:
   {
    
    if (navigator.appVersion.charAt (0)<'5')
    {
    var layers=document.all.tags ("div");
    }
    else {
    var layers=document.getElementsByTagName("div");
    }
    layers[0].style.visibility='hidden';
    layers[1].style.visibility='hidden';
    layers[2].style.visibility='hidden';
    layers[3].style.visibility='visible';
    layers[4].style.visibility='hidden';
    layers[5].style.visibility='hidden';
    layers[6].style.visibility='hidden';
    layers[7].style.visibility='hidden';
    layers[9].style.visibility='hidden';
   
    return;
   }
    case 6:
   {
    
    if (navigator.appVersion.charAt (0)<'5')
    {
    var layers=document.all.tags ("div");
    }
    else {
    var layers=document.getElementsByTagName("div");
    }
    layers[0].style.visibility='hidden';
    layers[1].style.visibility='hidden';
    layers[2].style.visibility='hidden';
    layers[3].style.visibility='hidden';
    layers[4].style.visibility='visible';
    layers[5].style.visibility='hidden';
    layers[6].style.visibility='hidden';
    layers[7].style.visibility='hidden';
    layers[9].style.visibility='hidden';
   
    return;
   }
    case 7:
   {
    
    if (navigator.appVersion.charAt (0)<'5')
    {
    var layers=document.all.tags ("div");
    }
    else {
    var layers=document.getElementsByTagName("div");
    }
    layers[0].style.visibility='hidden';
    layers[1].style.visibility='hidden';
    layers[2].style.visibility='hidden';
    layers[3].style.visibility='hidden';
    layers[4].style.visibility='hidden';
    layers[5].style.visibility='visible';
    layers[6].style.visibility='hidden';
    layers[7].style.visibility='hidden';
    layers[9].style.visibility='hidden';
    return;
   }
   case 8:
   {
    
    if (navigator.appVersion.charAt (0)<'5')
    {
    var layers=document.all.tags ("div");
    }
    else {
    var layers=document.getElementsByTagName("div");
    }
    layers[0].style.visibility='hidden';
    layers[1].style.visibility='hidden';
    layers[2].style.visibility='hidden';
    layers[3].style.visibility='hidden';
    layers[4].style.visibility='hidden';
    layers[5].style.visibility='hidden';
    layers[6].style.visibility='visible';
    layers[7].style.visibility='hidden';
    layers[9].style.visibility='hidden';
   
    return;
   }
   
   
 }

}