Thanks Okie, I'll try that.
However, McBee disturbs me when he quotes
 "sorry but The minimum stake for a back bet at SP is $5. The minimum liability if laying is $30"  
i.e. a lay actual SP price of 4.0 will risk $30 and return $10; while a price of 7.0 will return $5?  
Methinks me's getting it.  However, to the powers that be: perhaps you could consider a tutorial? Please.
Regards
Ern