Wi-fi connection preference

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http://androidforums.com – I still use my really old router with b/g specifications. Works for my needs but now noticed that some neighbor got really powerful router and is not secured. My phone nowadays prefers to connect to that open network. I wonder if there is any setting where I can ask to connect to home network only. I do have autoconnect feature set so that when I am on the go and pass by the (ISP) hotspot, it downloads mails and stuff. Thanks in advance. (General)