function przewin(dir)
{
	did = document.getElementById('main_text');
	if(dir == 'down')
	{
		did.scrollTop += 3;
		d = setTimeout("przewin('down')", 2);
	}
	if(dir == 'up')
	{
		did.scrollTop -= 3;
		u = setTimeout("przewin('up')", 2);
	}
}