Hey guys i'm using this script for a gallery of moving pictures. But its moving to fast for my likes and wanted to know if you could tell me what needs to be changed so that I can slow it down! heres the script

mouseX = _xmouse;
menuX = menu._x;

if (mouseX > 180) {
diff = (mouseX-100)/15;
}
if (mouseX < 180) {
diff = (100-mouseX)/15;
}
if (mouseX <= 250 && menuX <= 25) {
setProperty("menu", _x, menuX+diff);
}
if (mouseX >= 250 && menuX >= -4000) {
setProperty("menu", _x, menuX-diff);
}
if (menu._x >= 25) {
menu._x = 25;
} else if (menu._x <= -4000) {
menu._x = -4000
;
}
gotoAndPlay(2);