/*
 *
 */
function tree_expand (val)
{
	var status     = '';
	status     = document.getElementById(val).style.display;
	
	if (status == 'block')
	{
		document.getElementById(val).style.display = 'none';
	}
	else
	{
		document.getElementById(val).style.display = 'block';
	}
}