A Little Help Needed

programming flash
1

For a site I’m working on, I’m using a simple mouse-over opacity trick using this action script:

mouseInterval = setInterval(changeAlpha,10);

function changeAlpha() {
    logo._alpha = Math.round(_root._xmouse/775*150);
}

Now, with that, it makes it so the 100% max opacity is at the right side.

How would I go about making it so the 100% opacity will be at the LEFT side?

I would normally be able to figure this out, but I think too much graphics work over the weekend might have shorted out my brain. X_X