<td><input  type="checkbox" name="FooterMenu" value="1"
        <?php if($FooterMenu == 1): ?> checked="checked" <?php elseif($FooterMenu != 1):?> checked="unchecked" <?php endif;?>/>        

You shouldn't have a colon after the if queries and you aren't using braces. I'm also pretty certain that the value for a box to be unchecked is actually just blank, not "unchecked". I suggest trying this:

<td><input type="checkbox" name="FooterMenu" value="1" checked="<?php if($FooterMenu == 1){echo "checked";}else{echo "";} ?>" /></td>
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