Navigating menus

This is what i tried:

on the main page (note not all my code just showing what has to do with the menus)

took almost everything out of my maincode page and put it in a function called playgame()

Global selection=1
;If selection=1 Mainmenu()
;If selection=2 playgame()
;If selection=3 options()

While Not KeyHit(1) ; loop until ESC is pressed
  If selection = 1 Then
    Mainmenu() ; main menu sets selection to 2 if the play game button is pressed or sets selection to 3 if the options button is pressed.
  ElseIf selection = 2 Then
    playgame() ; move game code into its own function.  When game ends set selection = 1 again to show the main menu.
  ElseIf selection = 3 Then
    options() ; display the options menu.  When the back button is pressed, set selection to 1 and the main menu will be shown.
  End If
Wend

My Mainmenu() function

Function Mainmenu()
Graphics 800,600,32,2


mainimage=LoadImage("mainmenu.png")
continue=LoadImage("Playbutton.png")
;mouse=LoadImage("mouse.png")
MaskImage continue,255,0,255



While Not KeyHit(1)
;mouse_x=MouseX()
;mouse_y=MouseY()
Cls


DrawImage mainimage,0,0
DrawImage continue,100,400
;DrawImage mouse,mouse_x,mouse_y
Flip

If ImageRectCollide(continue,100,400,0,MouseX(),MouseY(),5,5) And MouseHit(1)
selection=2
End If


If KeyHit(2)
selection=3
End If

Delay 5
Wend

End Function

my options() function

;Options
Function options()
Graphics 800,600,32,2

Backbutton=LoadImage("Backbuttons.png")

DrawImage backbutton,0,0

While Not KeyHit(1)

If ImageRectCollide(backbutton,0,0,0,MouseX(),MouseY(),5,5) And MouseHit(1)
selection=1
End If



Delay 5
Wend

End Function

my playgame() function

Function playgame()

Graphics 800,600,32,2
;Mid handles all of the images and creates a image called paddle.
HidePointer

AutoMidHandle True
   paddle=CreateImage(70,15)
   ball=CreateImage(10,10)
AutoMidHandle False
   pausedpic=LoadImage("Paused.png")

;draws on the empty image container..
SetBuffer ImageBuffer(paddle)
   Rect 0,0,70,15,1
SetBuffer ImageBuffer(ball)
   Oval 0,0,10,10,1
SetBuffer BackBuffer()

;Copys the ball image 3 times these will be our lifes displayed on the bottom of the screen.
   life1=CopyImage(ball)
   life2=CopyImage(ball)
   life3=CopyImage(ball)

While Not KeyHit(1)
Cls


;Calls functions.
addplayercontrols()
drawmyimages()
addcollisions()
addtext()

;conditional functions
If KeyHit(P)
   Pause(pausedpic)
End If

;small delay in the loop for less slow down.
;flips, ends the loop and termanates the program..
Delay 5
  Flip
Wend
End

End Function

Doesnt work.. it shows the main menu, but when clicking on the play button (change selection to = 2, in thoery calling the playgame() function.)

but it just sits there...