function zobraz_od_do(od,pocet)
	{
	for (i = od; i <= pocet; i++)
		{
		var el = document.getElementById('q'+i); 
		el.style.display = '';
		if (navigator.appVersion.substring(0,1) >= 3)
			{
			document.images['img_help_q'+i].src = 'img/up.gif';
	        }
		}
	}
	
function zobraz_nic_od_do(od,pocet)
	{
	for (i = od; i <= pocet; i++)
		{
		var el = document.getElementById('q'+i); 
		el.style.display = 'none';
		if (navigator.appVersion.substring(0,1) >= 3)
			{
			document.images['img_help_q'+i].src = 'img/right.gif';
	        }
		}
	}
	
function color_tb(toto,barva)
	{
	var el = document.getElementById(toto); 
	el.style.color = '#'+barva;
	}