Hiding prices until product page.

Hello, I am a general newbie, but do know how to ammend basic php and CSS files manually in text editors so, my question is:

I have products that, until an option is selected have no price, however having all of the products show up in the category view as £0 is unacceptable as it just looks confusing to the customer and makes the site look incomplete.

Is there a CSS or PHP file that I can edit so that in the category view, it only shows the product image and title?  And the £0 price is only shown once on the product page itself, so that it is clear to people that they need to make a selection.

Thanks

I have for now changed the colour and text size, so that the information is still there but not visible.  If there is a simple way to remove all together I would still like to learn how.

Thanks

Just delete the price code from views/listing_product.inc.php ;) Or set up conditions.