/* Cookie part */
function createCookie(name, value, days)
{
	if (days)
	{
		var date = new Date();
		date.setTime(date.getTime() + (days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name + "=" + value + expires + "; path=/";
}

function readCookie(name)
{
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++)
	{
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0)
			return c.substring(nameEQ.length,c.length);
	}
	return null;
}

/* obsługa interfejsu */
function LoadInterfaceFromCookie(element_id)
{
	var element = document.getElementById(element_id);
	if(element == null) return;
	var cookie_val_height = readCookie("boi_interface_height_" + element_id);
	if(cookie_val_height == null) return;
	var cookie_val_visibility = readCookie("boi_interface_visible_" + element_id);
	if(cookie_val_visibility == null) return;
	if(cookie_val_visibility == 'true')
	{
		element.style.visibility = "visible";
		element.style.height = cookie_val_height;
	} else
	{
		element.style.visibility = "hidden";
		element.style.height = 0;
	}
}

function ToggleElement(element_id)
{
	var element = document.getElementById(element_id);
	if(element == null) return;
	if(element.style.visibility != "hidden")
	{
		createCookie("boi_interface_height_" + element_id, element.clientHeight, null);
		createCookie("boi_interface_visible_" + element_id, false, null);
	}
	else
	{
		createCookie("boi_interface_visible_" + element_id, true, null);
	}
	LoadInterfaceFromCookie(element_id)
}