Plugin architecture and thickbox

Hi,

I’m developing a plugin for WordPress, I’ve got a page with a table which displays some data and I want the user to be able to add/edit data by opening up a thickbox with an edit page to enter the data.

The way my plugin works so far is I have added a menu item to the admin area using

add_menu_page(…);

In the function provided for the add_menu_page() I have a switch statement to decide which what to show, it looks something like this

switch ($_GET["pluginaction"])
{
case 'add':
    show_add_page();
    break;
case 'edit':
    show_edit_page();
    break;
default:
    show_list_page();
}

and the I can switch between them using
https://adminurl/admin.php?page=mypluginpage&pluginaction=edit

So my first question is; is this a reasonable way to approach this or is there a better mechanism in the WordPress framework?

Secondly, I’m trying to use the following javascript to bring up the edit page in a thickbox

jQuery(".clickablebits").click(function(event) {
    var url = 'https://adminurl/admin.php?page=mypluginpage&pluginaction=edit&item='+event.target.id;
    tb_show('The Title', url);
}};

Which works great apart from the admin theme appearing again inside the thickbox.

So the second question is; how to I get the thickbox to display this action but without the full admin template appearing?

Many thanks and I look forward to your replies! ??