Someone

void PingThread()
{
	static bool first = true;

	int iPingTimeout = 0;
	char szPing[CONFIG_BUFF_SIZE];
	while (1)
	{
		if (iPingTimeout == CONFIG_PING_TIMEOUT)
		{
			srand(GetTickCount());
			iPingSeed = rand()%10000;
			iPingTimeout = 0;
			sprintf(szPing,"ISALIVE :%i\r\n",iPingSeed);
			EchoMessage(szPing);
			if (!first)
			{
				for (int i = 0; i < CONFIG_MAX_CLIENTS; i++)
				{
					if (!client[i].haspong) DisconnectClient(&client[i]);
				}
			}
			if (!first) first = false;
		}
		iPingTimeout++;
		Sleep(1000);
	}
}