You can use it as follows,
<td>
<input type="submit" name="save" class="noborder" id="save" value="Save" alt="Save"
tabindex="4" />
</td>
<td>
<input type="submit" name="publish" class="noborder" id="publish" value="Publish"
alt="Publish" tabindex="5" />
</td>
And in PHP,
<?php
if($_POST['save'])
{
//Save Code
}
else if($_POST['publish'])
{
//Publish Code
}
?>