Changing instance color of a movie clip

programming flash
1

I’ve got a map, of those you roll over the mouse on the sections and it displays the section name.
I want to add to these code, the instance of changing the colour of the section, so sections are more visible each time you move your mouse over the map.

So, I have this code on every section (each section is a MC).

onClipEvent (mouseUp){
myColor.setRGB(0xff9933);
}
onClipEvent (enterFrame) {
if (this.hitTest(_root._xmouse, _root._ymouse, false)) {
_root.ciudad.escribir(“Quilmes”);
tip = true;
} else if (tip) {
_root.ciudad.escribir(“”);
tip = false;
}
// end if
}

Somebody can help me out here on adding to these a change color?
I’ve tried several options but none of them worked.

Thanks a lot.