How to make clicking and scrolling work with Trackpad on Mac

My system is Mac OS X 10.5.8.
Edit Info.plist file located in:
 /System/Library/Extensions/ApplePS2Controller.kext/Contents/PlugIns/ApplePS2Trackpad.kext/Contents/
Login as root:
sudo su -
enter password:
vi /system/Library/Extensions/ApplePS2Controller/Contents/PlugIns/ApplePS2Trackpad.kext/Contents/Info.plist


edit this part of the file
<key>Synaptics TouchPad</key>
<dict>
<key>CFBundleIdentifier</key>
<string>com.apple.driver.ApplePS2Trackpad</string>
<key>IOClass</key>
<string>ApplePS2SynapticsTouchPad</string></font>
<key>IOProbeScore</key>
<integer>5000</integer>
<key>IOProviderClass</key>
<string>ApplePS2MouseDevice</string></font>
</dict>

Just remove the "Apple" so it reads
 <key>Synaptics TouchPad</key>
<dict>
<key>CFBundleIdentifier</key>
<string>com.apple.driver.ApplePS2Trackpad</string>
<key>IOClass</key>
<string>PS2SynapticsTouchPad</string></font>
<key>IOProbeScore</key>
<integer>5000</integer>
<key>IOProviderClass</key>
<string>PS2MouseDevice</string></font>
</dict>
Now repair permissions:
chown -R root:wheel /System/Library/Extensions/ApplePS2Controller.kext/Contents/PlugIns/ApplePS2Trackpad.kext/Contents/Info.plist
chmod -R 755 /System/Library/Extensions/ApplePS2Controller.kext/Contents/PlugIns/ApplePS2Trackpad.kext/Contents/Info.plist
exit
Reboot...........
Now you will be able to click and scroll using trackpad.