// JavaScript Document
<!--飞动的图片  -->
<!-- Begin
<!--初始位置  -->
var xPos = 0;
var yPos = 0;
<!--初始底部： var yPos = document.body.clientHeight;  -->
var step = 1;
var delay = 30; 
var height = 0;
var Hoffset = 0;
var Woffset = 0;
var yon = 0;
var xon = 0;
var pause = true;
var interval;
Flyimg.style.top = yPos;
function changePos() {
width = document.body.clientWidth;
height = document.body.clientHeight;
Hoffset = Flyimg.offsetHeight;
Woffset = Flyimg.offsetWidth;
Flyimg.style.left = xPos + document.body.scrollLeft;
Flyimg.style.top = yPos + document.body.scrollTop;
if (yon) {
yPos = yPos + step;
}
else {
yPos = yPos - step;
}
if (yPos < 0) {
yon = 1;
yPos = 0;
}
if (yPos >= (height - Hoffset)) {
yon = 0;
yPos = (height - Hoffset);
}
if (xon) {
xPos = xPos + step;
}
else {
xPos = xPos - step;
}
if (xPos < 0) {
xon = 1;
xPos = 0;
}
if (xPos >= (width - Woffset)) {
xon = 0;
xPos = (width - Woffset);
   }
}
function start() {
Flyimg.visibility = "visible";
interval = setInterval('changePos()', delay);
}
start();
//  End -->