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'; 
}
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 = ''; 
}