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;
/*img1*/


var pause = true;

var interval;

img.style.top = yPos;


function changePos() {

width = document.body.clientWidth;

height = document.body.clientHeight;

Hoffset = img.offsetHeight;


Woffset = img.offsetWidth;


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

var tpp = yPos + document.body.scrollTop;

if(tpp<208)
tpp=210;
img.style.top = tpp;


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);

   }
/*img1*/

}

function start() {

img.visibility = 'visible';


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

}

function pause_resume() {

if(pause) {

clearInterval(interval);

pause = false;

}

else {

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

pause = true;

   }

}

start();