I have 2 Custom Content Types

1. Item for sale
2. Bid(offer) - this one has a node reference url to the first item

I created a view (block) which shows the people with their offers- list of Bids
http://i40.tinypic.com/34pg852.png

I need to edit this view in such a way that is will be only visible to the person who created the Item for sale (author of the first content type may only see this block).

How can I achieve this? I cant seem to find a way with Contexual filters :( help

http://i44.tinypic.com/f23nn5.png

I have 2 custom content types: Item for sale, and Bid (offer). The latter has a node reference URL to a node of the first content type.

I created a view (block) which shows the people with their offers.

I need to edit this view in such a way that is will be only visible to the person who created the Item for sale (author of the first content type may only see this block).

How can I achieve this? I cant seem to find a way with contextual filters.