Detecting Wi-Fi in HTC Desire

[Syamhtc]

Hi, I am using HTC Desire A8181 model.
Problem is, i am not able to detect wireless network in my mobile.
Suppose i am using broadband connection to my computer through wireless router. I would like to use this wireless network into my HTC mobile. But it is not detecting this network.
Note: My mobile is able to detect other(unknown) wireless networks.
Please let me know how to detect and use my wireless network in my HTC Desire phone.

Thanks in advance.