var num_parents = 6; 

function sub_nav(id,action) 
{ 
if (action == 1) 
{ 
document.getElementById(id+'_l').className = "sub_nav"; 
document.getElementById(id+'_m').className = 
"sub_nav"; 
document.getElementById(id+'_r').className = "sub_nav"; 
} 
else 
{ 
document.getElementById(id+'_l').className = 
"sub_nav_invisible"; 
document.getElementById(id+'_m').className = 
"sub_nav_unlit"; 
document.getElementById(id+'_r').className = 
"sub_nav_invisible"; 
} 
} 

function mnu(id) 
{ 
for (i=1;i<=num_parents;i++) 
{ 
if (i != id) 
{ 
document.getElementById(i+'_l').className = 
"nav_invisible"; 
document.getElementById(i+'_r').className = 
"nav_invisible"; 

if (i==8) 
document.getElementById(i+'_m').className = 
"navspecial_unlit"; 
else 
document.getElementById(i+'_m').className = 
"nav_unlit"; 

document.getElementById('s'+i).className = "invisible"; 
} 
} 
document.getElementById('s0').className = "invisible"; 

if (id > 0) 
{ 
if (id == 8) 
{ 
document.getElementById(id+'_l').className = 
"navspecial"; 
document.getElementById(id+'_m').className = 
"navspecial"; 
document.getElementById(id+'_r').className = 
"navspecial"; 
} 
else 
{ 
document.getElementById(id+'_l').className = "nav"; 
document.getElementById(id+'_m').className = "nav"; 
document.getElementById(id+'_r').className = "nav"; 
} 

document.getElementById('s'+id).className = "visible"; 
} 

if (id == 0) 
{ document.getElementById('s0').className = "visible"; } 
} 

function hide_child(id) 
{ 
document.getElementById('s'+id).className = "invisible"; 
document.getElementById('s0').className = "visible"; 
}