display a complete node i want to display a node (from a menu callback), but when i do this:

echo node_view(node_load($_POST['classid']));


it displays the node without the page template. How do show the entire node, just like someone navigated to '/node/xxx'.

by the way, i can't just redirect to 'node/xxxx' because i need to leave the url without any parameter (stupid requirement by employers)
It's a bit strange that node_view is not returning a fully formatted node. The node module calls node_view inside it's own hook_menu to handle node/%nid requests.

Is there any chance that your CSS is selecting on something specific to node/%nid pages or your templates are setup in a non-standard way. 

Can you show us the exact HTML string that is being returned by that function and the HTML string you are expecting?