According to the powerful Wikipedia: A bookmarklet is an applet, a small computer application, stored as the URL of a bookmark in a web browser or as a hyperlink on a web page.
With one click lets you view all the images in a given web page, then with a simple click you can host the images on yout new image hosting.
Just edit the following code:
It's as simple as creating a link pointing to the previous code. The text of your link which will be the bookmark of the user, it can even be a picture and accompanying text is the alt attribute of the same. For example, if you drag this link: Uplod to Dev Chevereto to your bookmarks toolbar, you can see running on the spot.