function zobraz(tohle)
	{
	var el = document.getElementById(tohle);
	if (el.style.display == 'none')
		{
		el.style.display = '';
		var el = document.getElementById(tohle+'_answer');
		if (navigator.appVersion.substring(0,1) >= 3)
			{
			document.images['img_help_'+tohle].src = 'img/up.gif';
	        }
		}
	else
		{
		el.style.display = 'none';
		var el = document.getElementById(tohle+'_answer');
		if (navigator.appVersion.substring(0,1) >= 3)
			{
			document.images['img_help_'+tohle].src = 'img/right.gif';
	        }
		}
	}
	
function zobraz_vse(pocet)
	{
	for (i = 1; 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(pocet)
	{
	for (i = 1; 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';
	        }
		}
	}