Image Gallery - Add OnClick To OnMouseover?

I started with an Image Gallery javascript (from Jeremy Keith) in order to have an onMouseover effect for a menu, at the client's request--they wanted small moused-over pics in the menu to prompt a larger version of the photo in another column. Works great. But the href in the code, when clicked, currently links to the larger img opening in a new window. I want to add an onClick so that the user is taken to another page.

Here's the JS:
function showPic(whichpic) {
if (document.getElementById) {
document.getElementById('placeholder').src = whichpic.href;
if (whichpic.title) {
document.getElementById('desc').childNodes[0].nodeValue = whichpic.title;
} else {
document.getElementById('desc').childNodes[0].nodeValue = whichpic.childNodes[0].nodeValue;
}return false;
} else {
return true;
}}

var previousToggle=null;
function toggleMe(a){
var e=document.getElementById(a);
if(!e)return true;
if(e.style.display=="none"){
e.style.display="block";
if(previousToggle)previousToggle.style.display="none";
previousToggle=e;
} return true;
}

And here's the code:
<a onMouseover="toggleMe('para1'); showPic(this); return false;" href="images/commercial_600.jpg" title="abcdefg">
<img src="images/pix_smaller3.jpg" style="float:left" width="70" height="70"></a>