Concatenating values in a select box

[ecojohnson]

I have a form which includes a select box. Each selection in the select box has two values which should be on the same line. The problem I have it how to set them up at a certain length away from one another.

<select MULTIPLE NAME="selectname" SIZE="5" style="width:470">
<OPTION VALUE="8">8&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;18</OPTION>
<OPTION VALUE="9">9&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;19</OPTION>
<OPTION VALUE="10">10&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;20</OPTION>
</select>

As you can see, I have to use a bunch of non-breaking spaces to make this look the way I want. If the values are all the same length, this will work (it's ugly, but it will work). However, this doesn't solve the problem in this case because the values are different lengths, and they will appear unaligned.

Any ideas on how to resolve this problem?