Help with Zoom in/out Navigation!

:pac:Hello guys…how r u?

Well the reason why Im posting this is cus I need u to guide me with a zoom in/out navigation Im trying to build

Take a look to this site:
http://www.julianwolkenstein.com/jw.html

Im trying to build a navigation just like that…I know is not easy at least for me cus Im a beginer with AS

I got this .FLA

As u can see my .fla works whereever you click on the stage…I just need it to work with the Images…you see what I mean?

This .flas has an movie clip on the stage with these actions:

///////////

onClipEvent (mouseDown) {
if (i>0) {
return;
}
zoom = true;
dir == 1 ? (dir=-1) : (dir=1);
if (dir == 1) {
pt = {x:_root._xmouse, y:_root._ymouse};
}
}
onClipEvent (enterFrame) {
if (!zoom) {
return;
}
_root._xscale += diri200/20;
_root._yscale += diri200/20;
var pt2 = {x:pt.x, y:pt.y};
_root.localToGlobal(pt2);
_root._x -= (pt2.x-pt.x);
_root._y -= (pt2.y-pt.y);
i++;
if (i == 12) {
zoom = false;
i = 0;
}
}
onClipEvent(load)
{
var i = 0;
}

///////

How can I make it zoom in/out only with the Images/buttons ?

I will appreciate any help guys!!!

Thanks