sp;
		<button type="button" style="width: 120pt;" onclick="undo_last_point()"><nobr>Remove last</nobr></button>
		<button type="button" style="width: 120pt;" onclick="reset_all_points()"><nobr>Reset all</nobr></button>
	</div>
	<table class="formula">
	<tr>
	<td rowspan=3>
g<sub>i</sub>(x) = 
	</td>
	<td>
<sub>k</sub>
	</td>
	<td rowspan=3>

		<table class="formula">
		<tr>
		<td style="border-bottom:1px solid black">
x - x<sub>j</sub>
		</td>
		</tr>
		<tr>
		<td>
x<sub>i</sub> - x<sub>j</sub>
		</td>
		</