function showScreens()
{
	var a = document.getElementById('screens_a');
	var b = document.getElementById('screens_b');
	if(getStyle(b,'display')=='none')
	{
		a.style.display = 'none';
		try{
			b.style.display = 'table';
		}
		catch(e)
		{
			b.style.display = 'block';
		}
	}
	else
	{
		a.style.display = 'block';
		b.style.display = 'none';
	}
}
function showRelease(id)
{
	var tr = document.getElementById('release_' + id);
	var a = document.getElementById('link_' + id);
	if(tr.style.display=='none')
	{
		try{
			tr.style.display = 'table-row';
		}
		catch(e)
		{
			tr.style.display = 'block';
		}
		a.innerHTML = 'cacher';
	}
	else
	{
		tr.style.display = 'none';
		a.innerHTML = 'voir';
	}
}