button image upload in bootstrap,jquery and php -


i need create button width 55 , height 45. button should contain default image. when user wants change it, can choose image computer selecting button , once selected image should set button , whenever hover mouse should display change , select again able change image it. how it. know this. plz me. ex: in scratch website https://scratch.mit.edu, after login,in profile page can see image button


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