Plus and minus in javascript

Hi all!
I have a little problem with javascript.
Can someone give the code for plus (+) and minus (-) like this:

<table>
<tr>
<td>
Headset
</td>
<td>
$20
</td>
</tr>
</table>
<input name="sumoftableprice" value="">

Please help!

What is it you're trying to do? Do you need a link that appears as a (+) and (-) and when you click it, it shows the code you pasted? That's what it sounds like to me, but I don't want to reply with the wrong answer if that's not what you want.