Zooming in v2.5

Can someone please tell me how to zoom in to the object in “3D view” window in version 2.5
I am using mac with no mouse.

In the User Preferences / Input tab, select ‘Emulate 3 Button Mouse’
Rotate = Alt+LMB
Pan = Shift+Alt+LMB
Zoom = Ctrl+Alt+LMB
This works with the apple mouse, if you’re just using a trackpad see if it still works.

In v2.49 i used to zoom in or out using two fingers on the trackpad it was easier, thanks for help.