function showExtendedDesc(num)
{
	document.getElementById('short_desc').style.display = 'none';	
	document.getElementById('long_desc').style.display = 'block';	
}
function showShortDesc(num)
{
	document.getElementById('short_desc').style.display = 'block';	
	document.getElementById('long_desc').style.display = 'none';	
}