function toggle_subcategory(id, img1, img2)
{
	if (navigator.appVersion.indexOf("MSIE") == -1)
	{
		if (e = document.getElementById('tab_' + id))
		{
			i = document.getElementById('img_' + id);
			if (e.style.display != 'none')
			{
				e.style.display = 'none';
				i.src = img1;
			}
			else
			{
				e.style.display = 'table';
				i.src = img2;
			}
		}
	}
	else
	{
		if (e = document.getElementById('tab_' + id))
		{
			i = document.getElementById('img_' + id);
			if (e.style.display != 'none')
			{
				e.style.display = 'none';
				i.src = img1;
			}
			else
			{
				e.style.display = 'inline';
				i.src = img2;
			}
		}
	}
}

folder_red = new Image();
folder_red_open = new Image();
folder_green = new Image();
folder_green_open = new Image();
folder_red.src = 'ikony/folder_red.png';
folder_red_open.src = 'ikony/folder_red_open.png';
folder_green.src = 'ikony/folder_green.png';
folder_green_open.src = 'ikony/folder_green_open.png';