SVG: zoom gesture with javascript

my webpage consits of a large svg drawing with embedded images and links.

The user shoud zoom in by clicking the开发者_开发问答 mouse and moving the cursor to the right. this is similar to photosho cs5 zoom gesture.

How can I implement that gesture to zoom in the SVG picture using javascript? Possibly with libs raphael or jQuery SVG.

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Check first example/demo in http://www.evanbyrne.com/article/super-gestures-jquery-plugin and this gallery http://random.friggeri.net/jquery-gestures/ maybe it will help you.