How do i zoom the glCanvas with respect to the mouse pointer..

Hello there..

How can i achieve zooming in OpenGL..??

I am using Orthographic projection.. I am able to achieve zooming but it zooms in and out with respect to the origin(0,0) in other words, when i zoom in, all the objects should move towards the origin...

What i want is that when i zoom in, all the objects should move towards the mouse pointer.,.. and when i zoom out, all the objects must move away from the mouse pointer...

Can any one help me in order to achieve this..??

Thanks in advance..

Regards
Rakesh Patil