document.write("<div id='ddd' style='position:absolute; left:297px; top:114px; width:100px; height:100px; z-index:100'><a href=http://www.mics.com.cn target=_blank><img src=images/guanggao.gif width=100 height=100 border=0></a></div>");
var xPos = 20;
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;
ddd.style.top = yPos;
function changePos() {
width = document.body.clientWidth;
height = document.body.clientHeight;
Hoffset = ddd.offsetHeight;
Woffset = ddd.offsetWidth;
ddd.style.left = xPos + document.body.scrollLeft;
ddd.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() {
ddd.visibility = "visible";
interval = setInterval('changePos()', delay);

}

function pause_resume() {
if(pause) {
clearInterval(interval);
pause = false;
}
else {
interval = setInterval('changePos()',delay);
pause = true;
   }
}
start();