var divLeft = 0;
var divTop = 0;
var divWidth = 80;
var divHeight = 80;
var divImg = "/img/ad2.gif";
var divUrl = "http://www.iloveroc.org.tw/fengdis.asp";
var divTitle = "¹x¦H¥x¿W¥÷¤l±MÄæ";

document.write("<DIV id=\"adDiv\" style=\"position:absolute; left:"+divLeft);
document.write("px; top:"+divTop+"px; width:"+divWidth+"px; height:"+divHeight);
document.write("px; z-index:1;\" onMouseOver=\"javascript:window.clearInterval(varId)\"");
document.write(" onMouseOut=\"javascript:beginMoveAd();\"><a href=\""+divUrl+"\" target=\"_blank\">");
document.write("<img src=\""+divImg+"\" border=\"0\" alt=\""+divTitle+"\"></a></DIV>");

var _stepx=2;_stepy=2;

var moveSpeed=40;

var varId;
//setInterval ID 

function moveAd()
{
 var adLeft=parseInt(adDiv.style.left);
 var adTop=parseInt(adDiv.style.top);
 var adWidth=parseInt(adDiv.style.width);
 var adHeight=parseInt(adDiv.style.height);
 var _bodyLeft=document.body.scrollLeft;
 var _bodyTop=document.body.scrollTop;
 var _bodyHeight=document.body.clientHeight+_bodyTop;
 var _bodyWidth=document.body.clientWidth+_bodyLeft;
 if(adLeft<=_bodyLeft)
 {
  _stepx=2;
 }
 if(adTop<=_bodyTop)
 {
  _stepy=2;
 } 
 if((adLeft+adWidth)>=_bodyWidth)
 {
  _stepx=-2;
 }
 if((adTop+adHeight)>=_bodyHeight)
 {
  _stepy=-2;
 }
 adDiv.style.left=adLeft+_stepx;
 adDiv.style.top=adTop+_stepy;
} 

function beginMoveAd()
{
 varId = window.setInterval("moveAd()",moveSpeed);
}

window.onload=beginMoveAd;