Help with SUM and IF with MySQL

I am trying to query the sum of products by category.  I have prices for New and Used.  I am trying to just show a report of overall sales by category.  The new price and used prices are in two different columns.

Here is a general idea of what i am trying to do.  This is Mysql 5.  My example below is just me talking it out in a general matter to get the idea across.

select sum(if condition is new price new, else priceUsed) as totalValue
from products
group by category

I am not sure how to do the sum with the if statement, if that is even possible.
theideabulbAsked:
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KeldenCommented:
Try:

select sum( case when new then newprice else priceused end ) as totalValue, category
from products
group by category

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theideabulbAuthor Commented:
good job, you got to it quick!
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