Toggle Control With Dual Function?

I have a Javascript function that toggles a 'show/hide' table row:

//CONTROL

Code:

<a href="#" onclick="toggle('ROW 1, this)"><img src="../../Images/plus.gif" border="0" /></a>
//JAVASCRIPT

Code:

function toggle(id, obj) {
var matchingElements = new Array();
if (document.getElementsByClassName) {

[code]....

Which works fine, but what I need is something like this:

Control 1:
Toggle - ROW 1 (+ Close ROW 2 (if visible))
Control 2:
Toggle - ROW 2