漂浮广告 visibility: visible;">

var xPos = 300;

var yPos = 200;

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;

img1.style.top = yPos;

function changePos()

{

width = document.body.clientWidth;

height = document.body.clientHeight;

Hoffset = img1.offsetHeight;

Woffset = img1.offsetWidth;

img1.style.left = xPos + document.body.scrollLeft;

img1.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()

{

img1.visibility = "visible";

interval = setInterval('changePos()', delay);

}

function pause_resume()

{

if(pause)

{

clearInterval(interval);

pause = false;}

else

{

interval = setInterval('changePos()',delay);

pause = true;

}

}

start();