function pokazPodrzedne(id_nadrzedny)
	{
	var a_p = document.getElementsByTagName("p");
	for (var i = 0; i < a_p.length; i++)
		{
		if(a_p[i].className == "menu_oferta_bloczek _" + id_nadrzedny)
			{
			a_p[i].style.display = "block";
			}
		}

	}


function ukryjWszystkie()
	{
	var a_p = document.getElementsByTagName("p");
	for (var i = 0; i < a_p.length; i++)
		{
		if(a_p[i].className.substring(19, 21) == " _")
			{
			a_p[i].style.display = "none";
			}
		}
	}

// dla celów testowych, po wszystkim można skasować
function pokazWszystkie()
	{
	var a_p = document.getElementsByTagName("p");
	for (var i = 0; i < a_p.length; i++)
		{
		if(a_p[i].className.substring(19, 21) == " _")
			{
			a_p[i].style.display = "block";
			}
		}
	}

function displayWindow(url, width, height)
	{
	var scrollbars = 'no';
	if(width > screen.width)
		{
		width = screen.width;
		scrollbars = 'yes';
		}
	if(height > screen.height)
		{
		height = screen.height;
		scrollbars = 'yes';
		}
	var Win = window.open(url,"displayWindow",'width=' + width + ',height=' + height + ',resizable=0,menubar=no,left=0,top=0,scrollbars=' + scrollbars );
	}