Hi, I'm practically new in Linux and Ubuntu. I have Ubuntu 11.10, along side with Windows XP, in my laptop, it a Compaq Presario V3000, I can connect to the internet by wireless, and ubuntu recognizes my network card witch is a "Broadcom-BCM4311 802.11b/g WLAN", but when I'm on the internet sometimes it disconnects by it self, and after a few minutes it reconnects, when I first turn on my laptop and use Ubuntu,I get disconnected after 15 minutes, and then reconnects instantly, but then after that, I gets disconnected like every 2 or 3 minutes and then it takes more time to reconnect, like 5 or 10 minutes. I've only tried this solution, but it didn't work, but I don't know if I did it correctly:

http://ubuntuforums.org/showthread.php?t=1860799

I did what the is in post #5. but I still have the problem, I read the rest of the forum, but I wasn't sure if I should do it or not. so please if someone could help me please, and if it's not much to ask please tell me step by step what to do, I haven't get used to Ubuntu yet, so please and Thank you