2009RTC link to item (page)

I am trying to devise an HTML link for our intranet to the item page in NAV 2009RTC. Using only only the known SKU

I am aware of this format:

DynamicsNAV://localhost/DynamicsNAV/CRONUS International Ltd./runpage?page=30&bookmark=120000000089083237343

But I only know the SKU, not the bookmark.

Any clever ideas to do this simply?

Thanks!