function show()
{
if (document.getElementById('top-panel').style.display == 'none')
{
	 document.getElementById('top-panel').style.display='block';
	 document.getElementById('sub-panel').style.display='none';
	} 
else	 
{
	 document.getElementById('top-panel').style.display='none';
	  document.getElementById('sub-panel').style.display='block';
}	 	 
}