How can I switch to Space 1 with the mouse?

What can I do to be able to switch to space 1 easily with my mouse only ? I touch about an Exposé corner but there is a limited list of actions possible... I though about the 3rd mouse button but there is no space command in there... Any idea ? Any trick ? EDIT : I see that on the 3rd button mouse, there is a "Other..." item in the popup action list. Choosing this opens a dialog where I have to choose an applescrit (as far as I know). Is it possible to make a script that switch to Space 1. PS : I really want to shift to space one in 1-move or 1-click. I know how to go to Space 1 using only the mouse, But not "at once".