Some research help GIFT

Hello,

I have NO problems with installing , indexing image collections , searching 
with GIFT whatsoever,  however here is my problem

I work on ways to automate image annotation by reusing knowledge across 
media.

E.G.   The system would use  text surrounding the image in a HTML page and 
use this contextual information to tag the image with keywords (This is 
already done) , now what i need todo is , take this random image and query 
for other images in the collection which are similar using GIFT and autotag 
all of them with the same set of keywords.

So to sum it up i need to query for a random image which has not been 
indexed in the collection, is there any possible way todo it currently , or 
does anyone know how todo it , any hints in this direction would be of great 
help.

Thanks
Ajay Chakravarthy