var
  timer;

function smenu(submenu,state)
{
 var estilo = document.getElementById(submenu).style;
 
 if (state==1 || state==3) 
 {  	
   estilo.visibility = "visible";
   clearTimeout(timer);
   if (state==3)
	{
 	   timer = setTimeout('smenu(\''+submenu+'\',0)', 1500)
	}
 }
 else {	estilo.visibility = "hidden"; 
 }
 if (submenu!='sm1') { document.getElementById('sm1').style.visibility = "hidden"; }
 if (submenu!='sm2') { document.getElementById('sm2').style.visibility = "hidden"; }
 if (submenu!='sm3') { document.getElementById('sm3').style.visibility = "hidden"; }
 if (submenu!='sm4') { document.getElementById('sm4').style.visibility = "hidden"; }
}

function hideall()
{
 document.getElementById('sm1').style.visibility = "hidden";
 document.getElementById('sm2').style.visibility = "hidden";
 document.getElementById('sm3').style.visibility = "hidden";
 document.getElementById('sm4').style.visibility = "hidden";
}