var blog_okna_sprawdzane;
blog_okna_sprawdzane = 0;
function przewin_down (id_element, wielkosc_bloku)
{
	element = document.getElementById(id_element);

	offset_top = element.offsetTop*(-1);
	if(offset_top == (element.offsetHeight-wielkosc_bloku) || (element.offsetHeight-wielkosc_bloku) < 0)
	{
		return true;
	}
	offset_top = offset_top + 49;
	if(offset_top > (element.offsetHeight-wielkosc_bloku))
	{
		element.style.top = '-' + (element.offsetHeight-wielkosc_bloku) + 'px';
		return true;
	}
	element.style.top = '-' + offset_top + 'px';
	return true;
}
function przewin_up (id_element, wielkosc_bloku)
{
	element = document.getElementById(id_element);

	offset_top = (element.offsetTop*(-1));
	if(offset_top == 0 && (element.offsetHeight-wielkosc_bloku) > 0)
	{
		return true;
	}
	
	offset_top = offset_top - 49;
	
	if(offset_top < 0)
	{
		element.style.top = '0px';
		return true;
	}
	element.style.top = '-' + offset_top + 'px';
	return true;
}
function pokaz_przewijanie()
{
	if(blog_okna_sprawdzane == 1) return true;
	for(var i = 1;i<3;i++)
	{
		element = document.getElementById('notatka_'+ i);
		if(element == null) return true;
		switch(i)
		{
			case 1:
				if(element.offsetHeight < 105) continue;
		
				element_up = document.getElementById('przewin_up_'+ i);
				element_up.style.display = 'block';
		
				element_down = document.getElementById('przewin_down_'+ i);
				element_down.style.display = 'block';
			break;
			case 2:
				if(element.offsetHeight < 475) continue;
		
				element_up = document.getElementById('przewin_up_'+ i);
				element_up.style.display = 'block';
		
				element_down = document.getElementById('przewin_down_'+ i);
				element_down.style.display = 'block';
			break;
		}
	}
	blog_okna_sprawdzane = 1;
}