Michael, I discovered that if you put the following script into a button with it's autoHilite off, you will get a very smooth transition albeit slow. It takes about 5 seconds on my machine. on MouseUp put "0" into clr repeat 255 set the backgroundColor of me to clr,clr,clr add 1 to clr wait 1 end repeat end mouseUp Can you work with this? Cheers, Roger