function fillSerwisy(nav,tablica)
{
	var box = document.getElementById(nav).elements[0];
	var number = box.options[box.selectedIndex].value;
	if (!number) return;
	var list = tablica[number];
	var box2 = document.getElementById(nav).elements[1];
	box2.options.length = 0;
	for(i=0;i<list.length;i+=2)
	{
		box2.options[i/2] = new Option(list[i],list[i+1]);
	}
}