skittish mouse cursor

I created a game and at the end of it I have two images quit game, and play again. I also have a mouse pointer which I move using MouseX(), MouseY(). I was using the MouseClick command but it didn't seem to work very well so I changed it to MouseDown and it works a little better but not great. Also the mouse cursor is really skittish any ideas do I need a delay routine or something?

If MouseDown(LEFTMOUSEBUTTON) And quit\frame = 1
End
EndIf
; restart game
If MouseDown(LEFTMOUSEBUTTON) And play\frame = 1
SetStartGameParameters()
EndIf

If you could show me a bit more of the code, I could try to
take a more thorough look into your problem. I'm just a begginer to Blitz Plus but i'll give it a shot.