In standby modus disconnect WiFi. Sollution??

When my Imac is going in standby modus he disconnect with WiFi. When i want to use the Mac again for internet of mail, i have to reconnect to my network. Is there a sollution for this so the Mac is always connected with my network??
Please help.

By stand by do you mean it's sleeping? If so run Software Update or download and install:
http://support.apple.com/kb/DL1501

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