Help: getURL not working on all browsers to access Javascript

Hi everyone. This is my first post. I have a question regarding a website I am developing.

I had previously developed a navigation bar with rollover images in Dreamweaver to link to a javascript command in a seperate folder. However to reduce the download time and have a more uniform look I've redone the navbar in Flash which I like alot. However if I use the getURL command in the actionscript button to access the javascript it only works in Safari and NO other browser.

The navbar exists on the same page as the html on a layer.

This is the site without the Flash navbar:
www.nibroctrilogy.com/WIP/

And this is the site with the Flash navbar that only works in Safari:
www.nibroctrilogy.com/WIP2/

The javascript command is:
<a href="javascript:;" onclick="dw_scrollObj.scrollTo('wn',0,0); return false" onmouseout="MM_swapImgRestore()" onmouseover="MM_swapImage('home','','images/nav/home2.gif',0)"><img src="images/nav/home1.gif" name="home" width="67" height="26" border="0" id="home" /></a>

The actionscript command is:
on (release) {
getURL("javascript:dw_scrollObj.scrollTo('wn',0,0) ; return false");
}

Any help on this would be much appciated. I am working in Flash 8.

Thanks!

Okay got it to work in almost all browsers except Firefox for windows. The offending code was the "return false" parameter.
Anyone have any clues about how I can get it to work properly in Firefox for Windows?

Thanks