Party lights script

[pkblu154]

well i have a question in the following script how can i make it keep changing the backpal without stoping?
// NPC made by Draktha
if (playerenters) {
setbackpal afirebackpal.gif;
sleep.5;
setbackpal duskpal.png;
sleep.5;
setbackpal picsgold.gif;
sleep.5;
setbackpal picsgravity.gif;
sleep.5;
setbackpal picslightblue.gif;
sleep.5;
setbackpal picsyellowgreen.gif;
}
if (playersays(party lights off)) {
setbackpal pics1.png}
if (playersays(party lights on)){
setbackpal afirebackpal.gif;
sleep.5;
setbackpal duskpal.png;
sleep.5;
setbackpal picsgold.gif;
sleep.5;
setbackpal picsgravity.gif;
sleep.5;
setbackpal picslightblue.gif;
sleep.5;
setbackpal picsyellowgreen.gif;
}
oh and i dont care if u steal it.. it doesnt work right anyways