// f zaznaczajaca/odznaczajaca wszystkie checkboxy
function check_all_fnc(hook)
{
	var formHook = document.check_form;
	if (hook.checked == true)
	{
		for (var a=0; a<formHook.length; a++)
		if (formHook.elements[a].type == "checkbox")
		{
			formHook.elements[a].checked = true;
		}
	}
	else
	{
		for (var a=0; a<formHook.length; a++)
		if (formHook.elements[a].type == "checkbox")
		{
			formHook.elements[a].checked = false;
		}
	}
}