<!-- Begin
//more javascript from http://www.webjx.com
var xPos = 20;			// 起始横向位置(从左算起，单位象素)
var yPos = document.body.clientHeight;	// 页面本身高度
var step = 1; 
var delay = 60; 			// 速度，值越大速度越慢
var height = 0;
var Hoffset = 0;
var Woffset = 0;
var yon = 0;
var xon = 0;
var pause = true;
var interval;
imgpd.style.top = yPos;
function changePos() {
width = document.body.clientWidth;		// 判断浏览器窗口的宽度
height = document.body.clientHeight; 	// 判断浏览器窗口的高度
Hoffset = imgpd.offsetHeight;
Woffset = imgpd.offsetWidth;
imgpd.style.left = xPos + document.body.scrollLeft;
imgpd.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() {
imgpd.visibility = "visible";
interval = setInterval('changePos()', delay);
}
function pause_resume() {
if(pause) {clearInterval(interval);pause = false;}
else {interval = setInterval('changePos()',delay);pause = true;}
}
start();
//  End -->