<SCRIPT>
function cols(c1, c2, c3, c4, c5, c6, c7){
 this.c1 = c1;
 this.c2 = c2;
 this.c3 = c3;
 this.c4 = c4;
 this.c5 = c5;
 this.c6 = c6;
 this.c7 = c7; }
rainbow = new cols("red", "orange", "yellow", "green", "blue", "indigo", "violet");
fade = new cols("white", "DDDDDD", "BBBBBB", "999999", "777777", "555555", "333333", "black");
greens = new cols("darkgreen", "forestgreen", "green", "lawngreen", "lightgreen", "limegreen", "palegreen");
sunset = new cols("skyblue", "slateblue", "violet", "darkorange", "red", "darkred", "black");
function cycle(type){

 scheme = type;

 document.bgColor = scheme.c1;

 timerID=setTimeout('document.bgColor = scheme.c2', document.selector.interval.value * 10);

 timerID=setTimeout('document.bgColor = scheme.c3', document.selector.interval.value * 20);

 timerID=setTimeout('document.bgColor = scheme.c4', document.selector.interval.value * 30);

 timerID=setTimeout('document.bgColor = scheme.c5', document.selector.interval.value * 40);

 timerID=setTimeout('document.bgColor = scheme.c6', document.selector.interval.value * 50);

 timerID=setTimeout('document.bgColor = scheme.c7', document.selector.interval.value * 60); }

</SCRIPT>
<FORM NAME="selector">
请选择你的变色方案:

<INPUT TYPE="button" VALUE="五彩缤纷" onClick="cycle(rainbow)">

<INPUT TYPE="button" VALUE="黑白渐变" onClick="cycle(fade)">

<INPUT TYPE="button" VALUE="绿色系列" onClick="cycle(greens)">

<INPUT TYPE="button" VALUE="日落西山" onClick="cycle(sunset)">
 

</FORM>