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;                    
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;                    
img.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() {                    
img.style.visibility = "visible";                  
interval = setInterval('changePos()', delay);                    
}   
function pause_resume() 
{ 
if(pause) 
{ 
clearInterval(interval); 
pause = false;} 
else 
{ 
interval_1 = setInterval('changePos()',delay); 
pause = true; 
} 
}            
start(); 
 
var xPos1 = 700;//
var yPos1 = 300;
var step1 = 1;
var delay1 = 30;                     
var height1 = 0;                     
var Hoffset1 = 0;                    
var Woffset1 = 0;                     
var yon1 = 0;                    
var xon1 = 0;                     
var pause1 = true;                    
var interval1;                    
img1.style.top = yPos1;                    
function changePos1() {                   
width1 = document.body.clientWidth;                    
height1 = document.body.clientHeight;                    
Hoffset1 = img1.offsetHeight;                    
Woffset1 = img1.offsetWidth;                   
img1.style.left = xPos1 + document.body.scrollLeft;                    
img1.style.top = yPos1 + document.body.scrollTop;                    
if (yon1) {                  
yPos1 = yPos1 + step1;                    
}               
else {             
yPos1 = yPos1 - step1;                    
}            
if (yPos1 < 0) {                  
yon1 = 1;                    
yPos1 = 0;                    
}                  
if (yPos1 >= (height1 - Hoffset1)) {                    
yon1 = 0;                    
yPos1 = (height1 - Hoffset1);                     
}                  
if (xon1) {                    
xPos1 = xPos1 + step1;                    
}                 
else {                 
xPos1 = xPos1 - step1;                   
}                  
if (xPos1 < 0) {                    
xon1 = 1;                   
xPos1 = 0;                   
}         
if (xPos1 >= (width1 - Woffset1)) {                    
xon1 = 0;           
xPos1 = (width1 - Woffset1);                    
}                    
}
function start1() {                    
img1.style.visibility = "visible";                  
interval1 = setInterval('changePos1()', delay1);                    
}   
function pause_resume() 
{ 
if(pause1) 
{ 
clearInterval(interval1); 
pause1 = false;} 
else 
{ 
interval1 = setInterval('changePos1()',delay1); 
pause1 = true; 
} 
}            
start1();