飘动的字符跟随鼠标

<style type="text/css">
.spanstyle {
COLOR: #00cccc; FONT-FAMILY: 宋体; FONT-SIZE: 10pt; POSITION: absolute; TOP: -50px; VISIBILITY: visible
}
</style>
<script>
var x,y
var step=18
var flag=0
var message="★小草莓之屋欢迎你的光临!"

message=message.split("")
var xpos=new Array()
for (i=0;i<=message.length-1;i++) {
xpos[i]=-50
}

var ypos=new Array()
for (i=0;i<=message.length-1;i++) {
ypos[i]=-200
}

function handlerMM(e){
x = (document.layers) ? e.pageX : document.body.scrollLeft+event.clientX
y = (document.layers) ? e.pageY : document.body.scrollTop+event.clientY
flag=1
}

function www_helpor_net() {
if (flag==1 && document.all) {
for (i=message.length-1; i>=1; i--) {
xpos[i]=xpos[i-1]+step
ypos[i]=ypos[i-1]
}
xpos[0]=x+step
ypos[0]=y

for (i=0; i<message.length-1; i++) {
var thisspan = eval("span"+(i)+".style")
thisspan.posLeft=xpos[i]
thisspan.posTop=ypos[i]
}
}

else if (flag==1 && document.layers) {
for (i=message.length-1; i>=1; i--) {
xpos[i]=xpos[i-1]+step
ypos[i]=ypos[i-1]
}
xpos[0]=x+step
ypos[0]=y

for (i=0; i<message.length-1; i++) {
var thisspan = eval("document.span"+i)
thisspan.left=xpos[i]
thisspan.top=ypos[i]
}
}
var timer=setTimeout("www_helpor_net()",30)
}

for (i=0;i<=message.length-1;i++) {
document.write("<span id='span"+i+"' class='spanstyle'>")
document.write(message[i])
document.write("</span>")
}

if (document.layers){
document.captureEvents(Event.MOUSEMOVE);
}
document.onmousemove = handlerMM;
www_helpor_net();
// -->
</script>