<img src="https://pbs.twimg.com/profile_images/473506797462896640/_M0JJ0v8.png" width="200" height="200" alt="" id="nkar" onclick='zoom()'>
<script>
var elem = document.querySelector('img'),
sign = 1,
stepSize = 50,
minSize = 200,
maxSize = 500,
curSize;
elem.onclick = function() {
curSize = elem.width + stepSize * sign;
elem.width = curSize;
elem.height = curSize;
if(curSize == minSize || curSize == maxSize) sign = -sign;
}
</script>
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