Wordpress alternative to using GET?
===

I currently have a plug in that displays the images of the authors that blog for my site.

The plug-in is as follows:

    function display_authors() {
        global $wpdb;
        $authors = $wpdb->get_results("SELECT * from $wpdb->users ORDER BY display_name");
	
	
        $output = '<ul id="authors">';

        foreach($authors as $author) {
	
            if($author->display_name != 'admin')
	        {
	            // display user image for each author
                $output .=  '<li class="author" id="author-'.$author->ID.'">';
		        // userphoto function echoes image HTML rather than returning it
		        $output .= userphoto($author->ID);
		        $output .= '</li>';
            }
	    }	
	
	    $output .= '</ul>';
	
	    echo $output;
    }

    add_shortcode('oe-list-authors', 'display_authors');

What I am wondering is how to link to a page where I will show some of the author's meta content and their latest posts etc.

I want this to be the same page because it needs to have the same parent in the nav bar.

Normally in PHP, you could check if there was a `GET` variable set so that you could either show the list of authors and the page content that goes with it, or the profile information for a particular author but I have no idea how to do it within the confines of Wordpress and I would really appreciate some help.
