function children_fields(e)
{
	var number_of_children = e.options[e.selectedIndex].value;
	for (var i = 1; i < 9; i++)
	{
		if (i <= number_of_children) _display = 'table-row';
		else _display = 'none';
		document.getElementById('child_block_'+i).style.display = _display;
	}
}