How create another instance of an object from a menu link

Hi,

I am very new to javascript and would like to make a change to a script I found online.
I am not sure how much code I can post here so here is the link to the full script:
http://www.dhteumeuleu.com/theories-of-mind/4/

The script is for a coverFlow style gallery that uses an xml file to load the initial gallery
images. I would like to know if it is possible to click on a link to load a different xml file
to change the images in the gallery.

I am not sure but I think the following is used to initalise or create the gallery object:
imf.create("imageFlow", 'cities.xml', 0.75, 0.15, 1.8, 10, 8, 4);

I need to be able to call the above from a menu and have tried the following:
<a href="javascript:void(0)" onClick="imf.create('imageFlow', 'london.xml', 0.75, 0.15, 1.8, 10, 8, 4));">London</a>
and
<a href="#" onclick="imf.create("imageFlow", 'london.xml', 0.75, 0.15, 1.8, 10, 8, 4);">London</a>
and
<a href="url_to_xml_filel" onclick="imf.create("imageFlow", 'london.xml', 0.75, 0.15, 1.8, 10, 8, 4);">London</a>

The first two examples do nothing and the last opens the xml file in a window.

Can someone please offer some advice.

Thanks in advance.

Below is another section of the script:
/* //////////// ==== public methods ==== //////////// */
return {
/* ==== initialize script ==== */
create : function (div, xmlfile, horizon, size, zoom, border, start, interval) {
/* ---- instanciate imageFlow ---- */
var load = function () {
var loaded = false;
var i = instances.length;
while (i--) if (instances.oCont == div) loaded = true;
if (!loaded) {
/* ---- push new imageFlow instance ---- */
instances.push(
new ImageFlow(div, xmlfile, horizon, size, zoom, border, start, interval)
);
/* ---- init script (once) ---- */
if (!imf.initialized) {
imf.initialized = true;
/* ---- window resize event ---- */
addEvent(window, 'resize', function () {
var i = instances.length;
while (i--) instances.resize();
});
/* ---- stop drag N drop ---- */
addEvent(document.getElementById(div), 'mouseout', function (e) {
if (!e) e = window.event;
var tg = e.relatedTarget || e.toElement;
if (tg && tg.tagName == 'HTML') {
var i = instances.length;
while (i--) instances.oc.onmousemove = null;
}
return false;
});
/* ---- set interval loop ---- */
setInterval(function () {
var i = instances.length;
while (i--) instances.run();
}, 16);
}
}
}
/* ---- window onload event ---- */
addEvent(window, 'load', function () { load(); });
}
}
}();

/* ==== create imageFlow ==== */
// div ID, imagesbank, horizon, size, zoom, border, autoscroll_start, autoscroll_interval
imf.create("imageFlow", 'middle-eastern.xml', 0.75, 0.15, 1.8, 10, 8, 4);