I need to select and save some specific images from a site by entering the url in the textbox in my site. 

I've loaded all the images from a site url, by using html agility. but now I don't know how to select and save.

For example, I enter <http://flipkart.com/> in my text box, it should load all images from that page, assume it contains 9 images, if 9 images loaded from a site and displayed as a gallery, from that gallery I will select 1 image click save. it should save somewhere in my site(may be a particular folder). 

I don't know how to save images from a site. 

would somebody give some reference or ideas to achieve this task of saving the image that is loaded when a url is given.

Thanks!