function h_countbitsfromleft(num) {
	if (num == 255)
		return(8);

	var i = 0;
	var bitpat = 0xff00; 
	while (i < 8) {
		if (num == (bitpat & 0xff))
			return(i);

		bitpat = bitpat >> 1;
		i++;
	}
	return(Number.NaN);
}

function numberOfBitsOnNetMask(netmask) {
	var total = 0;
	var t = netmask.split('.');
	for (var i = 0; i <= 3 ; i++)
		total += h_countbitsfromleft(t[i]);

	return total;
}

function getNetworkAddress(ipaddress, netmask) {
	return fixIP(ntoa(aton(ipaddress) & aton(netmask)));
}

function getBroadcastAddress(network, netmask) {
	return fixIP(ntoa(aton(network) ^ (~ aton(netmask))));
}

function getAddress(ipaddress, network) {
	return fixIP(ntoa((aton(network)) + (aton(ipaddress))));
}