Download first 1000 images from google search

I do some search to google images

http://www.google.com/search?hl=en&q=panda&bav=on.2,or.r_gc.r_pw.r_cp.r_qf.,cf.osb&biw=1287&bih=672&um=1&ie=UTF-8&tbm=isch&source=og&sa=N&tab=wi&ei=qW4FUJigJ4jWtAbToInABg

and the result is thousands of photos. I am looking for a shell script that will download the first n images, for example 1000 or 500.

How can I do this ?

I guess I need some advanced regular expressions or something like that. I was trying many things but to no avail, can someone help me please?