URL/Image Downloader

Question

Can anyone suggest a good software that lets you download file urls or image urls and put it on an organize structure you specify.

let say i have a bunch of images to download that is structure like this.

http://website.com/foods/vegetable/lettuce.jpg

http://website.com/foods/vegetable/eggplant.jpg

http://website.com/foods/vegetable/celery.jpg

http://website.com/animals/pets/cat.jpg

http://website.com/animals/pets/dog.jpg

http://website.com/animals/pets/hamster.jpg

I want to place it on my folder like this:

/Users/username/Documents/Downloads/vegetable/lettuce.jpg

/Users/username/Documents/Downloads/vegetable/eggplant.jpg

/Users/username/Documents/Downloads/vegetable/celery.jpg

/Users/username/Documents/Downloads/pets/cat.jpg

/Users/username/Documents/Downloads/pets/dog.jpg

/Users/username/Documents/Downloads/pets/hamster.jpg

Notice that when i downloaded the images, i am only interested in placing them in the secondary directory ("vegetable" and "pets") and didn't include the first directory anymore...

Is there any software that let me do this?

I have a MACOSX and Also have a Windows 7, So any would do for me.

Thank You.