window.status = e.button;

<DIV ID="demoDiv" STYLE="position:relative; left:100px; top:20px; width:220px; 
height:25px; color:blue; background-color:yellow;">Click me with the left button! 
Now with the right!</DIV>
<SCRIPT LANGUAGE="JavaScript">
<!--
var demoObj;

function init() {
  demoObj = document.getElementById("demoDiv");
  demoObj.addEventListener("click", colorItTan, false);
}

function colorItTan(e) {
  demoObj.style.backgroundColor = "tan";
  window.status = e.button;
}

onload = init; 
// -->
</SCRIPT>

Get on Netscape 6 browser and play with this demo. Click the left button and then the right button. See the different values printed to the status window: 1 for the left, 2 for the middle button, and 3 for the right button.

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