wifi doesnt work on centos 5.4

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hi all,
this is my first hit on the mailing list. hope i m posting in the right place.
well, i have a dell vostro 1510 laptop with broadcom wifi adapter. n it doesnt work! :(
i installed the wifi drivers with ndiswrapper.

iwconfig shows the following.

[root@laptop ~]# iwconfig
lo        no wireless extensions.

eth0      no wireless extensions.

sit0      no wireless extensions.

wlan0     IEEE 802.11g  ESSID:off/any  Nickname:"laptop"
          Mode:Managed  Frequency:2.417 GHz  Access Point: Not-Associated  
          Bit Rate=54 Mb/s   Tx-Power:32 dBm  
          RTS thr=2347 B   Fragment thr=2346 B  
          Encryption key:off
          Power Management:off
          Link Quality:0  Signal level:0  Noise level:0
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

strangely i cannot find the wlan0 config file in the /etc/sysconfig/network-scripts/!!

[root@laptop ~]# iwlist wlan0 scanning

wlan0     Scan completed :
          Cell 01 - Address: 00:xx:xx:91:xx:xx
                    ESSID:"thephenomenon"
                    Protocol:IEEE 802.11g
                    Mode:Managed
                    Frequency:2.412 GHz (Channel 1)
                    Quality:78/100  Signal level:-46 dBm  Noise level:-96 dBm
                    Encryption key:on
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 9 Mb/s
                              18 Mb/s; 36 Mb/s; 54 Mb/s; 6 Mb/s; 12 Mb/s
                              24 Mb/s; 48 Mb/s
                    Extra:bcn_int=100
                    Extra:atim=0
                    IE: WPA Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : TKIP CCMP
                        Authentication Suites (1) : PSK 
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : TKIP CCMP
                        Authentication Suites (1) : PSK 

i generated a wpa_passphrase and wpa_supplicant.conf is as follows

[root@laptop ~]# cat /etc/wpa_supplicant/wpa_supplicant.conf
ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=wheel

network={
        ssid="thephenomenon"
        key_mgmt=WPA-PSK
        psk=88a745bb68f4ff4fae41xxxxxxxxxxxxx5b1a66341ced3cxxxxxx2167b218d8c
}

now when i do a
[root@laptop ~]# wpa_supplicant -Dwext -iwlan0 -c/etc/wpa_supplicant.conf
Failed to read or parse configuration '/etc/wpa_supplicant.conf'.
[root@laptop ~]#

i get the above error. i have a WPA encryption in my router.

infact earlier i used to get a connected status when i tried to connect it with wpa_gui once. but later i think i have screwed the config a bit

sorry for the long post... can someone plz guide me from here?
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