Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>
<script>
$(document).ready(function(){
    $("button").click(function(){
        $("img").attr("width",function(n, v){
            return v - 50;
        });
    });
});
</script>
</head>
<body>

<img src="img_pulpitrock.jpg" alt="Pulpit Rock" width="284" height="213"><br>

<button>Decrease image width by 50px</button>

</body>
</html>