How do I implement a "glass button" effect on a pre existing photo I have?

How would I implement a glass button effect on a pre existing photo I have.

Like, I already have an image, but I want to give it the effect of a glass button, how would I do this using gimp 2?

Here's a good example of a "glass button" effect

http://www.graphic-design-employment.com/images/glass-enamel-effect01.jpg
 
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