If / End If still biting me on the butt

function posterscr(posterlist as object) as object
    
    poster.SetListDisplayMode("best-fit")
    poster.SetContentList(PosterList)
    
'    if isauthenticated then
'        categories=["Search","Explore", "Tracks", "About","You"]
'    else
        categories=["Search","Explore"," Tracks","About"]
'    end if
    
    poster.SetListNames(categories)
    poster.SetListStyle("flat-category")
    poster.SetListDisplayMode("best-fit")
    poster.SetFocusedList(0)
    poster.SetFocusedListItem(0)
    poster.show()
    
    while true
    
        msg=wait(0,port)
        msgtype=type(msg)
        message=msg.getmessage()
        idx = msg.GetIndex()

        if type(msg) = "roPosterScreenEvent" then
			if msg.isScreenClosed() then 
				print "screen closed exit app"
				return -1
			else if msg.islistSelected() and idx=5 and isauthenticated=false then 
				authenticate()
				return -1
			else if msg.isListFocused() then 
				m.currentcategory=idx ' assign category to global variable
				'figure out which category was selected
				if idx = 0 then 
					print "search selected"
					' handle search section selected
				else if idx = 1 then 
					 print "explore selected"
					 'handle explore section selected
				else if idx = 2 then 
					print "top tracks selected"
					'handle top tracks selected
					'call display top tracks
				else if idx = 3 then 
					print "about this app selected"
					'show the about screen
				end if
			else if msg.isListItemSelected() then
				if m.currentcategory = 0 then 'we are in search section
					if idx = 0 then
						posterlist.Append(searchTracks())
					else if idx = 1 then 
						posterlist.Append(searchPeople())
					else if idx = 2 then
						posterlist.Append(searchGroups())
					else if idx = 3 then
						posterlist.Append(searchGenre())
					end if
				else 
					if m.currentcategory=1 then 'we are in Explore section
						print "explore section bla bla"
					else if m.currentcategory=2 then 'we are in Hot section
						posterlist.SetContentList(GetHotStuff())
					else if m.currentcategory=3 then 'we are in about section
						posterlist.setContentList(About())
					else if m.currentcategory=4 then 'we are in you section
						print "its all you babe"
					end if
				end if
			end if
        end if   
    end while
                
end function