Something not right

I have created the attached navigation bar but it seems to be causing me a few problems - if I leave a page containing the nav bar static for any length of time (approx. 5 mins) it locks up the browser (sometimes indefinitely)…

If I was doing this again I would probably go about creating it a different way but don’t really want to change it now.

Can you cast your eye over the following code (or attached file) and see if you can see anything that could be causing the problem…

Thanks


MC…‘spectrum’ - (band of color under horizontal navigation)

onClipEvent (load) {
visible = 0;
}
onClipEvent (enterFrame) {
if (visible == 1) {
if (_alpha<100) {
_alpha = _alpha+10;
}
if (_alpha == 100) {
_alpha = 90;
}
} else {
if (_alpha>0) {
_alpha = _alpha-10;
}
}
}


Drag-able mask - (masks ‘spectrum’ and lines up with nav button)

onClipEvent (enterFrame) {
_x = _x+_xmouse/3;
}


Each button instance x6 - (fades in and out the masked ‘spectrum’)

on (rollOver) {
spectrum.visible = 1;
}
on (rollOut, dragOut) {
spectrum.visible = 0;
}
on (release) {
getURL("…/…/retouching/");
}