var tempo

function clean ()
{
  if ((navigator.appName=='Netscape') && (navigator.appVersion.charAt (0)<'5'))
  {
	  window.document.viaje.visibility="hide";
      window.document.gpp.visibility="hide"; 
  return;
  }
 if (navigator.appVersion.charAt (0)<'5')
    {
    var layers=document.all.tags ("div");
    } 
	document.getElementById("viaje").style.visibility='hidden';     
    document.getElementById("gpp").style.visibility='hidden'; 
 return;
}

function hide(control){
	if(control == 1)
		tempo = setTimeout("clean();", 4500);
	else
		clearTimeout(tempo);
}

function menu (i)
{

switch(i)
 {	
  case 1:
   {
    if ((navigator.appName=='Netscape') && (navigator.appVersion.charAt(0)<'5'))
     {
      window.document.viaje.visibility="show";
      window.document.gpp.visibility="hide";      
     return;
     }
    if (navigator.appVersion.charAt (0)<'5')
    {
    var layers=document.all.tags ("div");
    }    
    document.getElementById("viaje").style.visibility='visible';     
    document.getElementById("gpp").style.visibility='hidden';    
    return;
   }
  case 2:
   {
    if ((navigator.appName=='Netscape') && (navigator.appVersion.charAt(0)<'5'))
     {
      window.document.viaje.visibility="hide";
      window.document.gpp.visibility="show";      
     return;
     }
    if (navigator.appVersion.charAt (0)<'5')
    {
    var layers=document.all.tags ("div");
    }    
    document.getElementById("viaje").style.visibility='hidden';     
    document.getElementById("gpp").style.visibility='visible';    
    return;
   }  
 }

}