No No no.
This is c-script not lite-c.
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Your code fix
//defineat start where your bmaps are.
panel* panelis;

panelis=pan_create("bmap = Angler_tga; pos_x = 0; pos_y = 0; flags = overlay, visible;", 10); // layer = 10

So next time to remove ir use:
pan_remove(panelis);//so it know which panel to delete or
panelis.visible=off;//if you want only switch it off.