以下是代码片段：

<SCRIPT language=JavaScript>
<!-- Begin
var speed = 20;
var cycledelay = 1000;
var maxsize = 48;

var x = 0;
var y = 0;
var themessage, size;
var esize = "";

function initArray() {
this.length = initArray.arguments.length;
for (var i = 0; i < this.length; i++) {
this[i] = initArray.arguments[i];
   }
}
var themessage2 = new initArray(
"网站通建站专家网",
"欢迎您的光临",
"企业建站",
"能成为您创业的好帮手"
); 
if(navigator.appName == "Netscape")
document.write('<layer id="wds"></layer><br>');
if (navigator.appVersion.indexOf("MSIE") != -1)
document.write('<span id="wds"></span><br>');
function upwords(){
themessage = themessage2[y];
if (x < maxsize) {
x++;
setTimeout("upwords()",speed);
}
else setTimeout("downwords()",cycledelay);

if(navigator.appName == "Netscape") {
size = "<font point-size='"+x+"pt'>";
document.wds.document.write(size+"<center>"+themessage+"</center>"+esize);
document.wds.document.close();
}
if (navigator.appVersion.indexOf("MSIE") != -1){
wds.innerHTML = "<center>"+themessage+"</center>";
wds.style.fontSize=x+'px'
   }
}
function downwords(){
if (x > 1) {
x--;
setTimeout("downwords()",speed);
}
else {
setTimeout("upwords()",cycledelay);
y++;
if (y > themessage2.length - 1) y = 0;
}
if(navigator.appName == "Netscape") {
size = "<font point-size='"+x+"pt'>";
document.wds.document.write(size+"<center>"+themessage+"</center>"+esize);
document.wds.document.close();
}
if (navigator.appVersion.indexOf("MSIE") != -1){
wds.innerHTML = "<center>"+themessage+"</center>";
wds.style.fontSize=x+'px'
   }
}
setTimeout("upwords()",speed);
//  End -->
</SCRIPT>

代码说明:

1. var maxsize = 48;  这句代码定义了文字变化为最大时的字体大小,单位是像素,可以根据我们的实际需要修改大小
2. var themessage2 = new initArray(
   "网站通建站专家网",
   "欢迎您的光临",
   "希望建站",
   "能成为您创业的好帮手"
   ); 

这段代码定义了效果中要显示的文字,每次显示一行的内容,共四行,可以根据我们的实际需要进行修改.

                            检测代码效果 请进