Try this or
<img src="http://img856.imageshack.us/img856/2333/ex1c.png" border="0" />
this
<img src="http://img254.imageshack.us/img254/4035/ex2k.png" border="0" />
Here the game randomly pick the "chance" variable.
If 1 the Sprite 1 will be destroyed, if 2 the Sprite 2 will be destroyed.