last_tab = 'tab1';

function show(layerName)
{ 
	document.getElementById(layerName).style.display = '';
} 

function hide(layerName)
{ 
	document.getElementById(layerName).style.display = 'none';
} 

function show_next(tab_name)
{
	document.getElementById(last_tab).className = 'tab';
	var curr = document.getElementById(tab_name);
	curr.className='tab_hover';
	hide(last_tab+'_data');
	show(tab_name+'_data');
	last_tab=tab_name;
}

function toggleArticleContents(id)
{
	var e = document.getElementById(id);
	var alink = "a" + id;
	var arrow = "arrow" + id;	
	var a = document.getElementById(alink);
	
	
	if (e.style.display == 'block')
	{
		e.style.display = 'none';
		document.getElementById(arrow).setAttribute("src","images/acas/common/navarrowdetail.gif");
	}
	else
	{
		e.style.display = 'block';
		
		try
		{
			a.style.display = 'none';
		}
		catch(ex)
		{
		}
		
		document.getElementById(arrow).setAttribute("src","images/acas/common/headingbullet.gif");
	}
}