How to get the button closer?

Hello group,

In an HTML file I'm trying to use three buttons. However, due to having space between them I put them in a table as following but still the space or  gap exists between each two buttons. I'm new to web development and have found HTML so tricky. Can somebody tell me what to do?

Thanks,
ak

<table  border="1">
<tr><td>
<input style="margin-left:100px;" type="button" onclick="document.setLocation('http://....)" value="Next" class="inputsubmit" />	
</td><td >
<input style="margin-left:100px;" type="button" onclick="document.setLocation('http://....')" value="Back" class="inputsubmit" />	
</td><td>
<input style="margin-left:100px;" type="button" onclick="document.setLocation('http://....')" value="Add to library" class="inputsubmit" />
</td></tr>
</table>

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