countdown from 3 to GO! with a simple code

you can countdown from 3 to go and change the color backround every sec.

                                    ` This code was downloaded from The Game Creators
                                    ` It is reproduced here with full permission
                                    ` http://www.thegamecreators.com
                                    
                                    `````````````countdown````````````````
set text size 30
cls (300)
text 150,200,"press a key to countdown"
suspend for key
cls (120)
text 250,200,"3"
sleep 1000
cls (128)
text 250,200,"2"
sleep 1000
cls (250)
text 250,200,"1"
cls (200)
text 250,200,"GO!"