Show crossed old price if there is discount

[servlet]

VM last. J last.
How to show crossed old price if there is discount.

Now VM shows for discounted products:
price old without discount non crossed (Baseprice) new price (Final salesprice) and discount amount...

and for non discounted products
Base price
Final salesprice
where base price = final saleprice
I need to show only sale price (one price) when there is no discount...

Which prices must I use? May be I have a mistake...

[dsrpmedia]

anyone? this should be a basic setting?!