Button edition

This is my code placed in post(status)
How to delete the border/frame around images?
I need only image to be button nothing more

<div>
<button onclick="document.getElementById('player').play()"><input type="image" src="MY IMAGE LINK"</button>
<button onclick="document.getElementById('player').volume+=0.3"><input type="image" src="MY IMAGE LINK"></button>
<button onclick="document.getElementById('player').pause()"><input type="image" src="MY IMAGE LINK"></button>
<button onclick="document.getElementById('player').volume-=0.3"><input type="image" src="MY IMAGE LINK"></button>
</div>

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This is how it look like
http://imageshack.us/photo/my-images/805/14055908.jpg

Anyone know how to change it?
thanks 😉