//document.write("<div id=\"B3_01\" style=\"position:absolute; left:297px; top:114px; width:20px; height:20px; z-index:1\"><img src='ad_images/001.gif' width='337' height='150' border='0'></div>");

var xPos=20;
var yPos=document.body.clientHeight;
var step=1;
var delay=20; 
var height=0;
var Hoffset=0;
var Woffset=0;
var yon=0;
var xon=0;
var pause=true;
var interval;
B3_01.style.top=yPos;

function changePos(){
 width=document.body.clientWidth;
 height=document.body.clientHeight;
 Hoffset=B3_01.offsetHeight;
 Woffset=B3_01.offsetWidth;
 B3_01.style.left=xPos+document.body.scrollLeft;
 B3_01.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(){
 B3_01.visibility="visible";
 interval=setInterval("changePos()",delay);
}

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