function show(c) { 
if (document.getElementById && document.getElementById(c)!= null) 
node = document.getElementById(c).style.display=''; 
else if (document.layers && document.layers[c]!= null) 
document.layers[c].display = ''; 
else if (document.all) 
document.all[c].style.display = ''; 
} 
function hide(c) { 
if (document.getElementById && document.getElementById(c)!= null) 
node = document.getElementById(c).style.display='none'; 
else if (document.layers && document.layers[c]!= null) 
document.layers[c].display = 'none'; 
else if (document.all) 
document.all[c].style.display = 'none'; 
}