Causing a onclick event on a <div> in a table through code

[Ty]

I have an example I have been playing with.

The page displays with a vertical menu (like an outlook menu) which is
built from a table. When the page loads the menu is collapsed. If you
click on on of the menu bars that menu slide open.

There is a separate java script file.

When the mouse goes over one of the menu bars it causes a init
function in the script file to run. If you click on the menu it runs
another function.

I want to have one of the menus expanded when the page loads but I
cannot figure out how to call the click event of the <divtag without
actually clicking on it.

Is this possible?

Thanks for helping a beginner.

Ty