Adding function for a link using plugin

Hi All can anyone help me with this.
I have created some menus in wordpress through a plugin. And it works fine. Every menu displays contents when it is clicked by a user by calling a function. My problem is that there are many links within contents. I want every link to be associated with a function just like we create a menu/sub-menu to associate it with menu/sub-menu. And the parameters are being passed in the URL. How it can be achieved.

Here is an example
<?php
add_submenu_page(__FILE__, ‘Test’, ‘Test’, 8, ‘test/t2’, ‘show_page’);
function show_page()
{
echo “Click Here“;
}
?>
When Test is clicked it calls the function show_page
And it displays something.

Now if someone clicks on “Click Here”, I want to call the same function that was callled by clicking the menu.

Please Help.
Thanks in Advance